题目内容
______it is to take a rest after a long run!
A.What a fun | B.How fun | C.What fun | D.How a fun |
C
解析试题分析:感叹句当被感叹的是名词时用What,当被感叹的是形容词或副词时用How ;这里fun表示“乐趣”时,是不可数名词。句意:长跑之后休息一下是多么有趣啊。
考点:考查感叹句的用法。
点评:本题难度适中。这里命题人命题的目的,考查考生fun的词性及用法的掌握情况,fun是高中必须要求四会的单词,提醒考生注意要求四会的单词必须掌握它们的词性及用法。
即学即练:_____ it will be when we all go on holiday together.
A.What a fun B.How fun C.What fun D.How a fun
解析:C。句意:我们大家一起去度假那可太有意思了。
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Medicine shouldn’t be kept where it is _____ to children.
A.possible | B.obtainable | C.enable | D.accessible |
Can you remember a morning when you’ve woken up to the ring of your alarm clock and wished you could stay in bed? You haven’t slept well, your hair is a mess. Worse, you can’t stop yawning. Yawning is universal to humans and many animals. Cats, dogs and fish yawn just like humans do! Yawning is an involuntary(无意识的,不自觉的) action during which you open your mouth and breathe deeply. The average duration of a yawn is about 6 seconds.
The purpose and cause of yawning are still a mystery. Scientists are not sure what causes a yawn. People yawn when they are tired or bored, but they also yawn when they aren’t. There are many ideas explaining why we yawn.
One idea is that yawning is a way for the body to become more alert by taking in more oxygen. A yawn increases the heart rate, forces carbon dioxide out of the lungs and blood stream, and brings oxygen to the brain. But one study showed that volunteers given a lot of oxygen did not yawn any less than before, while those given a lot of carbon dioxide did not yawn more.
Another idea is that early humans used yawning as a form of communication. If one decided it was time to sleep, they would tell the others by yawning and they would do it in return to show they agreed.
A third explanation comes from psychology professor Gordon Gallup of University at Albany in New York. He said that as people yawn, they cool off their brains. “Brains are like computers.” he said. “They only operate efficiently and effectively when they’re cool. Many things connected to yawning, like being tired, make the brain hot, and yawning can reduce the heat.”
Scientists have sent people into space, and created terrible nuclear weapons, but there are lots of seemingly simple things, such as why we yawn, or hiccup(打嗝), that they can’t figure out. Next time you are in class in the morning, let out a big yawn and watch to see how many of your classmates yawn in response!
【小题1】What’s the purpose of the description of how bad you may feel when you’re woken up in the morning?
A.To explain why humans yawn. |
B.To explain how humans start yawning. |
C.To lead into the topic of yawning. |
D.To complain about being woken up by the clock. |
A.A way to show that you feel hot. |
B.A way to get rid of carbon dioxide. |
C.A way to cool off your brain. |
D.A way to communicate. |
A.When you feel frustrated. |
B.The weather is hot. |
C.Someone else yawns near you. |
D.When you breathe in a lot of carbon dioxide. |
A.The real reason why humans and most animals yawn. |
B.Hiccups are an involuntary human action similar to yawns. |
C.The more an action can be studied, the easier it is to research. |
D.Finding out why humans yawn should be easier than sending people into space. |