1．The boy ______ my friend，Bill．（　　）
A．amB．isC．are

分析 這個男孩是我的朋友，Bill．

解答 答案：B 根據(jù)主語"the boy"可知主語為單數(shù)，單數(shù)is，復(fù)數(shù)are．故選B．

點(diǎn)評 本題考查主謂一致．謂語動詞的判斷要看主語，主語為單數(shù)用is，主語為復(fù)數(shù)用are

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Do you sometimes find you want to eat chocolate or ice cream very much? Do you then make it but feel guilty about it later?

The next time this happens to you, think back if you have had enough sleep over the last 3-5 days. Many adults and even teens have noticed that they crave "midnight snacks" when working or watching TV late.

New research shows that lack of sleep could lead us to have an increased appetite (食欲)- especially for the unhealthy kind.

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During the following visit, their sleep patterns were exchanged. After the last night of the session, the volunteers were offered as much food as they wanted to eat. Researchers noticed that in both sessions, people who sleep less ate on an average 300 calories more than those who had slept more. This was much more calories than what their bodies would need to make up for the three fewer hours of sleep.

What Is Going On?

The researchers then analyzed the chemicals (化學(xué)成分) in the blood of the people in the study. What they noticed was surprising. High levels of ghrelin (a chemical that makes us hungry) and lower levels of leptin (the chemical that tells the brain that it is satisfied) were found in the people with less sleep.

Even more surprising was that this group had higher levels of endocannabinoids - the same chemical that is caused by drugs such as cannabis (大麻). The endocannabinoid system causes a craving for sugar and fatty foods and leads to overeating even when the body is not hungry. This study suggests that sleep changes help produce chemicals in the body that are similar to taking drugs!

Furthermore, researchers noticed that food cravings continued for a long period of time, well after the lack of sleep. This increases the risk of over-eating for longer periods, leading to obesity (肥胖).

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