All plant cells are capable of taking up water. Even dead ones do to a certain degree. Absorption（吸收）of water by dead cell walls makes wood become larger. In common land plants, the living cells of roots take up most of the water. Land plants without roots do exist, however. Those greenish-yellow lichens（苔蘚）you see on rocks in the high mountains have no roots. Half a billion years ago, when water plants started to enter the land, the first land plants did not have roots.

Even among the flowering plants, one finds rootless forms. These flowering plants are “the higher plants” because they evolved（進化）recently and are thus considered higher on the evolutionary scale（進化度）. In the Peruvian desert, there grows one of these rootless higher plants, a bromeliad. It is a relative of the pineapple. Even if this plant had roots, they would be of no use, because where the plant grows, it never rains. The plant gets its water only from the dew（露水）it collects at night, when its leaves cool off. Such rootless plants, of course, can be moved with ease, but they will only grow when they are placed out in the open. If they are placed too near a house, the radiation from the heat of the house prevents the leaves from cooling and so prevents dew from forming, and the plant dies. In the southern United States and in Puerto Rico, one sees bromeliads growing high above the streets on the insulation（絕緣物）of electric wires. These plants get their water from rain, and the only soil they ever come in contact with is the dust that may blow on their leaves.

1．Wood becomes larger because of    .

A．dead cell walls                                           B．water entering dead cells

C．the growth of cells                                   D．the death of cells

2．The “bromeliad” is a plant that   .

A．has useless roots                                      B．is a pineapple

C．can grow anywhere                                 D．takes up water through its leaves

3．The most suitable title for this passage is “    ”.

A．Absorption of water by plants                     B．Rootless plants

C．Plants in the desert                                        D．Higher plants

 

【答案】

 

 B

 D

 A

【解析】

 

練習冊系列答案
相關習題

科目：高中英語 來源： 題型：閱讀理解

Seven Health Facts about Coffee

When you’re considering your morning coffee, here are some health facts to keep in mind:

1. Coffee Reduces Your Risk of Diabetes (糖尿病)

In a 2005 review of nine studies, researchers found that for those that drank four to six cups of coffee per day, versus only two or fewer, their risk for Type 2 diabetes decreased by almost 30 percent. The number decreased by 35 percent when people drank more than six cups per day. And if you’re picturing yourself running around the office with your eyes bugging out of your head, no worries because caffeinated and decaffeinated coffees provided much the same results.

2. Coffee Fights Free Radicals (自由基)

We often forget that coffee is actually a plant and like all plant foods, the coffee bean contains more than 1,000 naturally occurring substances called phytochemicals, which may help prevent disease. Many of these phytochemicals are antioxidants which protect the cells from damage from free radicals.

3. Coffee Improves Memory and Cognition

Researchers reported that volunteers who drank caffeinated coffee in the morning performed better than nondrinkers on tests that involved learning new information. Coffee can also improve cognitive function as we age. One study found that combining coffee with a sweet treat had an even bigger impact.

4. Coffee Can Increase Osteoporosis (骨質疏松)

It’s true that coffee can cause the body to excrete calcium in urine. We don’t want the body to rid itself of calcium because this can lead to osteoporosis. According to The Diet Channel, about five milligrams of calcium is lost per every six ounces of coffee consumed. But these calcium losses can be counter balanced with two tablespoons of milk or yogurt per cup of coffee.

5. Coffee Causes Wrinkles

Even though coffee has antioxidants, if you drink too much of it, it can cause wrinkling of the skin. This is a result of dehydration (脫水) which is the worst thing for your skin. So when you’re drinking that morning cup or two, make sure that you’re pairing it with water. Even better, add one tablespoon of chia seeds to your water and let them sit for 30 minutes. The chia seeds keep you even more hydrated than regular water.

6. Coffee Can Actually Cause Weight Gain

The blood sugar changes that a caffeine high produces can contribute enormously to a strong desire for it, according to iVillage. Coffee is also socially connected to food. For example, we pair coffee with dessert or that morning powdered doughnut. Additionally, when we crash from our caffeine high that’s when we reach for all sorts of fatty snacks to keep us going.

7. Conventional Coffee Is Laden with Pesticides (殺蟲劑)

The coffee plant is one of the most heavily sprayed crops. It’s coated with chemicals, pesticides, and herbicides, nothing you’d want to be swallowing. If you do drink coffee, make sure that it’s the organic variety, free from assorted chemicals that leech into our ground water and can make us sick down the road.

If you switch to decaffeinated coffee, make sure the caffeine (咖啡因) is removed in a natural way without the use of chemicals to do it. Often times, conventional decaffeinated coffee has more chemicals than regular.

   If you want to decrease the risk of diabetes by 35%, you need to take at least _____ cups of     coffee every day.

    A. seven            B. six          C. five             D. four 

If you are a heavy drinker of coffee, a far better way to avoid wrinkling of your skin is to drink water _____.

    A. less than usual  B. regularly        C. with sugar       D. with chia seeds

   Which of the following statements is wrong?

    A. Adding two spoons of milk to a cup of coffee can prevent calcium losses.

    B. Decaffeinated coffee has different effects from caffeinated coffee as to diabetes.

    C. Many phytochemicals protect the cells from damage from free radicals.

    D. The organic variety of coffee plant is free from assorted chemicals.

   The author has a/an _____ attitude towards drinking of coffee.

    A. positive     B. negative     C. objective        D. imaginative

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

All plant cells are able to take up water. Even dead ones do to a certain degree. Absorption of water by dead cell walls makes wood swell(腫脹). In common land plants, the living cells of roots take up most of the water. Land plants without roots do exist, however. Those greenish-yellow lichens(苔蘚)you see on tree trunks and on rocks in the high mountains have no roots. Half a billion years ago, when water plant started to invade the land, the first primitive land plants did not have roots; they were marsh (沼澤) plants.

Even among the flowering plants, one finds rootless forms. These flowering plants are the so-called higher plants because they evolved more recently and are thus considered higher on the evolutionary scale. In the Peruvian desert, there grows one of these rootless higher plants, a bromeliad. It is a relative of the pineapple. Even if this plant had roots, they would be of no use, because where the plant grows, it never rains. The plant gets its water exclusively from the dew it collects at night, when its leaves cool off. Such rootless plants, of course, can be moved with ease, but they will only grow when they are placed out in the open. If they are placed too near a house, the radiation from the heat of the house prevents the leaves from cooling and so prevents dew from forming, and the plant dies. In the southern United States and in Puerto Rico, one sees bromeliads growing high above the streets on the insulation of electric wires. These plants get their water from rain, and the only soil they ever come in contact with is the dust that may blow on their leaves.

Wood swells because of _______.

A. the dead cell walls          B. tiny drops of water entering the dead cell

C. the growth of the cell       D. the death of the cell

From the passage we know that the evolutionary scale is arranged according to ______.

A. evolutionary cycles                  B. heights and depths

C. time                                D. kinds

The bromeliad is a plant that _______.

A. has useless roots             B. is a pineapple

C. can grow anywhere           D. takes up water through its leaves

Which of the following is NOT true?

Water plants existed before land plants.

Only living plant cells take up water.

The greenish-yellow lichens are uncommon land plants.

The living cells of roots absorb more water than the rest of the plant.

The most suitable title for this passage is ______.

A. water intake by cells  B. rootless plantsC. plant in the desert   D. higher plants

查看答案和解析>>

科目：高中英語 來源：福建省南平市2010屆高三下學期適應性考試英語試題 題型：閱讀理解


All plant cells are capable of taking up water. Even dead ones do to a certain degree. Absorption（吸收）of water by dead cell walls makes wood become larger. In common land plants, the living cells of roots take up most of the water. Land plants without roots do exist, however. Those greenish-yellow lichens（苔蘚）you see on rocks in the high mountains have no roots. Half a billion years ago, when water plants started to enter the land, the first land plants did not have roots.
Even among the flowering plants, one finds rootless forms. These flowering plants are “the higher plants” because they evolved（進化）recently and are thus considered higher on the evolutionary scale（進化度）. In the Peruvian desert, there grows one of these rootless higher plants, a bromeliad. It is a relative of the pineapple. Even if this plant had roots, they would be of no use, because where the plant grows, it never rains. The plant gets its water only from the dew（露水）it collects at night, when its leaves cool off. Such rootless plants, of course, can be moved with ease, but they will only grow when they are placed out in the open. If they are placed too near a house, the radiation from the heat of the house prevents the leaves from cooling and so prevents dew from forming, and the plant dies. In the southern United States and in Puerto Rico, one sees bromeliads growing high above the streets on the insulation（絕緣物）of electric wires. These plants get their water from rain, and the only soil they ever come in contact with is the dust that may blow on their leaves.
64．From the passage we know that the evolutionary scale is graded according to _______ .
A. evolutionary cycles  B. heights and depths
C. time        D. kinds
65．The “bromeliad” is a plant that _______ .
A．has useless roots             B. is a pineapple
C．can grow anywhere  D. takes up water through its leaves
66．The most suitable title for this passage is “_______ ”.
A. Absorption of water by plants   B. Rootless plants
C. Plants in the desert       D. Higher plants

查看答案和解析>>

科目：高中英語 來源：2011屆浙江省寧波市高考模擬考試英語卷 題型：閱讀理解

Seven Health Facts about Coffee
When you’re considering your morning coffee, here are some health facts to keep in mind:
1. Coffee Reduces Your Risk of Diabetes (糖尿病)
In a 2005 review of nine studies, researchers found that for those that drank four to six cups of coffee per day, versus only two or fewer, their risk for Type 2 diabetes decreased by almost 30 percent. The number decreased by 35 percent when people drank more than six cups per day. And if you’re picturing yourself running around the office with your eyes bugging out of your head, no worries because caffeinated and decaffeinated coffees provided much the same results.
2. Coffee Fights Free Radicals (自由基)
We often forget that coffee is actually a plant and like all plant foods, the coffee bean contains more than 1,000 naturally occurring substances called phytochemicals, which may help prevent disease. Many of these phytochemicals are antioxidants which protect the cells from damage from free radicals.
3. Coffee Improves Memory and Cognition
Researchers reported that volunteers who drank caffeinated coffee in the morning performed better than nondrinkers on tests that involved learning new information. Coffee can also improve cognitive function as we age. One study found that combining coffee with a sweet treat had an even bigger impact.
4. Coffee Can Increase Osteoporosis (骨質疏松)
It’s true that coffee can cause the body to excrete calcium in urine. We don’t want the body to rid itself of calcium because this can lead to osteoporosis. According to The Diet Channel, about five milligrams of calcium is lost per every six ounces of coffee consumed. But these calcium losses can be counter balanced with two tablespoons of milk or yogurt per cup of coffee.
5. Coffee Causes Wrinkles
Even though coffee has antioxidants, if you drink too much of it, it can cause wrinkling of the skin. This is a result of dehydration (脫水) which is the worst thing for your skin. So when you’re drinking that morning cup or two, make sure that you’re pairing it with water. Even better, add one tablespoon of chia seeds to your water and let them sit for 30 minutes. The chia seeds keep you even more hydrated than regular water.
6. Coffee Can Actually Cause Weight Gain
The blood sugar changes that a caffeine high produces can contribute enormously to a strong desire for it, according to iVillage. Coffee is also socially connected to food. For example, we pair coffee with dessert or that morning powdered doughnut. Additionally, when we crash from our caffeine high that’s when we reach for all sorts of fatty snacks to keep us going.
7. Conventional Coffee Is Laden with Pesticides (殺蟲劑)
The coffee plant is one of the most heavily sprayed crops. It’s coated with chemicals, pesticides, and herbicides, nothing you’d want to be swallowing. If you do drink coffee, make sure that it’s the organic variety, free from assorted chemicals that leech into our ground water and can make us sick down the road.
If you switch to decaffeinated coffee, make sure the caffeine (咖啡因) is removed in a natural way without the use of chemicals to do it. Often times, conventional decaffeinated coffee has more chemicals than regular.
【小題1】   If you want to decrease the risk of diabetes by 35%, you need to take at least _____ cups of     coffee every day.

A．seven B．six C．fiveD．four
【小題2】If you are a heavy drinker of coffee, a far better way to avoid wrinkling of your skin is to drink water _____.
A．less than usualB．regularly C．with sugarD．with chia seeds
【小題3】   Which of the following statements is wrong?
A．Adding two spoons of milk to a cup of coffee can prevent calcium losses.
B．Decaffeinated coffee has different effects from caffeinated coffee as to diabetes.
C．Many phytochemicals protect the cells from damage from free radicals.
D．The organic variety of coffee plant is free from assorted chemicals.
【小題4】   The author has a/an _____ attitude towards drinking of coffee.
A．positiveB．negativeC．objectiveD．imaginative

查看答案和解析>>

同步練習冊答案