A.strength | B.position | C.steadiness | D.visibility |
A.when the Moon passes between the Sun and the Earth |
B.when all of the Moon passes through the Earth's umbra shadow |
C.when only a part of the Moon passes through the Earth's outer shadow |
D.when only a part of the Moon passes through the Earth's umbra shadow |
A.longer-lasting than most solar eclipses |
B.more common than partial or full lunar eclipse |
C.the result of the shadow cast by the Moon onto the Earth |
D.more difficult to observe than other types of lunar eclipse |
A.moonlight is less strong than sunlight |
B.a(chǎn) lunar eclipse is briefer than a solar eclipse |
C.a(chǎn) lunar eclipse lasts much longer than a solar eclipse |
D.special equipment can be employed to view a lunar eclipse |
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A.The Arrival of Chinese Supercomputers |
B.Homemade CPUs with a Long Way to Go |
C.The Supercomputers of Three Organizations in China |
D.Homemade CPUs on the Way for Local Supercomputers |
A.Dawning 6000 | B.Loongson microchips |
C.DIIC | D.Tianhe-1A |
A.cheap | B.suitable | C.expensive | D.modern |
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A.The wind helps pollinate. |
B.Bees are important in food crops. |
C.Bees give us a lot of delicious honey. |
D.Cherry trees are pollinated by bees. |
A.they move around too much |
B.new bees soon replace all the bees studied by researchers |
C.they are too tiny |
D.they never return to hives |
A.Poisons to kill birds. | B.Eating too much. |
C.Large insects. | D.Some virus. |
A.A large number of bees have died in the hive. |
B.Without bees, some foods would disappear from our diet. |
C.Only researchers in California want to know what kills bees. |
D.Large animals are easier to study than tiny insects. |
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A.Setting goals | B.Learning from others. |
C.Being honest | D.Keeping on reading . |
A.very grateful | B.not quite confident |
C.quite afraid | D.not very satisfied |
A.Win the Badwater Ultra-Marathon. |
B.Run a marathon to the South Pole. |
C.Run fifty marathons, in fifty states, in fifty days. |
D.Run a 135-mile ultra-marathon across Death Valley. |
A.life means achieving goals |
B.success is the greatest reward |
C.sports help develop our potential |
D.everyone may have great potential. |
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A.Use secret codes to record other people’s conversation. |
B.Be careful when opening an attachment. |
C.Never open any attachments. |
D.Never use secret codes. |
A.nobody seems to believe such things |
B.nobody knows the danger of the code |
C.tools can easily be used to tie dangerous codes to e-mails |
D.effective ways can never be found to deal with the problem. |
A.A moving picture cannot be used to spy. |
B.Electronic greeting cards cannot carry a secret code. |
C.A secret code is used to destroy the computer system. |
D.Any attachments sent to a computer may carry a secret code. |
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A.Mars is a little bigger than Earth. |
B.There are flowing rivers on Mars. |
C.People haven’t been to Mars so far. |
D.Scientists have discovered signs of life on Mars. |
A.Living in space. | B.Limited resources. |
C.Extreme conditions. | D.Interesting challenges. |
A.there is no serious danger |
B.people won’t be in any danger |
C.it’s difficult for people to realize the danger |
D.the danger may be caused by very small things |
A.Martian germs may be different from those on Earth. |
B.Martian germs may be brought back to Earth. |
C.People may carry germs to Mars. |
D.There may be germs on Mars. |
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A.To inform us that mobile phones are useful. |
B.To introduce the topic for discussion. |
C.To warn us that we should be careful. |
D.To tell us we should get phones ready for a trip. |
A.Fear of losing mobile phones. |
B.Habits of using mobile phones |
C.Eagerness for new mobile phones. |
D.Independence of mobile phones. |
A.Avoiding using phone for some time |
B.Learning more about modern technology. |
C.Protecting one’s phone against any damage. |
D.Not using a mobile phone in one’s daily work. |
A.It lets you know other people also lose their phones. |
B.It will give you a new phone through insurance. |
C.It enables you to reconnect with your acquaintance. |
D.It gives you a prescription to treat nomophobia. |
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C.Disadvantages of mobile phone. | D.Attitude toward mobile phone. |
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A.explanation | B.definition | C.introduction | D.comment |
A.most American universities are against the “three-year degree” model |
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C.professors are willing to accept the “three-year degree” model |
D.the “three-year degree” model can make college learning more efficient |
A.college students are offered the co-op program |
B.electives’ credits make up one quarter of the required credits |
C.a(chǎn)ll students are required to finish four-year education before graduation |
D.some excellent students can graduate ahead of time |
A.the author is a college professor |
B.the author thinks the cost of a university education is too high for people to afford |
C.the author considers the university education quality very important |
D.the author pays special attention to the all-round development of college students |
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C.University education should be watered down |
D.College education calls for reform |
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A.what mulch is and its advantages |
B.the best time to add mulch |
C.the bad effects of mulch |
D.what can be mulch on the soil surface |
A.tree barks | B.plastic | C.grass cuttings | D.cut-up leaves |
A.improve the condition of soil |
B.improve the ability of the soil to hold water |
C.provide a good environment for earthworms |
D.improve the growth of roots and increase the movement of water through the soil |
A.the best time to add mulch is in spring and summer |
B.the best time to add mulch is after the coldest weather arrives |
C.the best time to add mulch is exactly the same time of each year |
D.choosing the best time to add mulch can avoid attracting small animals |
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