题目内容
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. |
【小题1】C
【小题2】A
【小题3】C
【小题4】B
解析
小学学习好帮手系列答案
小学同步三练核心密卷系列答案Cold weather has a great effect on how our minds and our bodies work. Maybe that is why there are so many expressions that use the word “cold”. For centuries, the body’s blood has been linked closely with the emotions. People who show no human emotions or feelings, for example, are said to be cold-blooded. Cold-blooded people act in merciless ways. They may do brutal things to others, and not by accident. For example, a newspaper says the police are searching for a cold-blooded killer. The killer murdered someone, not in self-defense. He seemed to kill for no reason, and with no emotion, as if taking someone’s life meant nothing.
Cold can affect other parts of the body, the feet, for example. Heavy socks can you’re your feet, if your feet are really cold. But there is an expression—to get cold feet—that has nothing to do with cold or your feet.
The expression means being afraid to do something you have decided to do. For example, you agree to be president of an organization. But then you learn that all the other officers have resigned. All the work of the organization will be your responsibility. You are likely to get cold feet about being the president when you understand the situation.
Cold can also affect your shoulder. You give someone the cold shoulder when you refuse to speak to them. You treat them in a distant and cold way. The expression probably comes from the physical act of turning your back toward someone, instead of speaking to him face-to-face. You may give a cold shoulder to a friend who has not kept a promise he made to you, or to someone who has lied about you to others.
A cold fish is not a fish. It is a person. But it is a person who is unfriendly, unemotional and shows no love or warmth. A cold fish does not offer much of himself to anyone.
Out in the cold is an expression often heard. It means not getting something that everybody else got. A person might say that everybody but him got a pay raise, and that he was left out in the cold. And it is not a pleasant place to be.
71、The passage is intended to tell us that ______ .
| A．cold weather has a great effect on human bodies |
| B．many English expressions contain the word “cold” |
| C．cold is a word closely linked with human emotions |
| D．the word “cold” has many different meanings in English |
72、The underlined word “brutal” in Paragraph 1 most probably means “______”.
| A．impolite | B．illegal | C．cruel | D．extreme |
73、Which of the following expressions can best describe a person who is unwilling to offer anything to others?
| A．Cold-blooded. | B．To get cold feet. | C．A cold shoulder. | D．A cold fish. |
74、You can say Tom ______ if the teacher gives all the boys except him a pen as a prize.
| A．is given the cold shoulder |
| B．is left out in the cold |
| C．has got cold feet |
| D．is murdered by a cold-blooded killer |
75、We can draw a conclusion from the passage that ______ .
| A．all the expressions containing the word “cold” have a negative meaning |
| B．all the expressions containing the word “cold” have something to do with cold |
| C．people who show no human emotions or feelings have cold blood |
| D．many parts of the human body can be badly affected by cold |
Cold weather has a great effect on how our minds and our bodies work. Maybe that is why there are so many expressions that use the word “cold”. For centuries, the body’s blood has been linked closely with the emotions. People who show no human emotions or feelings, for example, are said to be cold-blooded. Cold-blooded people act in merciless ways. They may do brutal things to others, and not by accident. For example, a newspaper says the police are searching for a cold-blooded killer. The killer murdered someone, not in self-defense. He seemed to kill for no reason, and with no emotion, as if taking someone’s life meant nothing.
Cold can affect other parts of the body, the feet, for example. Heavy socks can you’re your feet, if your feet are really cold. But there is an expression—to get cold feet—that has nothing to do with cold or your feet.
The expression means being afraid to do something you have decided to do. For example, you agree to be president of an organization. But then you learn that all the other officers have resigned. All the work of the organization will be your responsibility. You are likely to get cold feet about being the president when you understand the situation.
Cold can also affect your shoulder. You give someone the cold shoulder when you refuse to speak to them. You treat them in a distant and cold way. The expression probably comes from the physical act of turning your back toward someone, instead of speaking to him face-to-face. You may give a cold shoulder to a friend who has not kept a promise he made to you, or to someone who has lied about you to others.
A cold fish is not a fish. It is a person. But it is a person who is unfriendly, unemotional and shows no love or warmth. A cold fish does not offer much of himself to anyone.
Out in the cold is an expression often heard. It means not getting something that everybody else got. A person might say that everybody but him got a pay raise, and that he was left out in the cold. And it is not a pleasant place to be.
【小题1】The passage is intended to tell us that ______ .
| A．cold weather has a great effect on human bodies |
| B．many English expressions contain the word “cold” |
| C．cold is a word closely linked with human emotions |
| D．the word “cold” has many different meanings in English |
| A．impolite | B．illegal | C．cruel | D．extreme |
| A．Cold-blooded. | B．To get cold feet. | C．A cold shoulder. | D．A cold fish. |
| A．is given the cold shoulder |
| B．is left out in the cold |
| C．has got cold feet |
| D．is murdered by a cold-blooded killer |
| A．all the expressions containing the word “cold” have a negative meaning |
| B．all the expressions containing the word “cold” have something to do with cold |
| C．people who show no human emotions or feelings have cold blood |
| D．many parts of the human body can be badly affected by cold |