题目内容
.Even at the narrowest of the Pacific, it is about 3,200 km ____________.
A. widely B. with cross C. crossing D. in width
D
Nuclear radiation (核辐射)has a certain mystery, partly because it cannot be detected (探测)by human senses. It can’t be seen or heard, or touched or tasted, even though it may be all around us. There are other things like that. For example, radio waves are all around us but we can’t detect them or sense them without a radio receiver. Similarly, we can’t sense radioactivity without a radiation detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things.
At very high levels, radiation can kill an animal or human being at once by killing plenty of cells in important organs(器官). Even the lowest levels can do serious damage. There is no level of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be serious. This is the case when only a few cells are hit, and when they are killed at once. Your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They reproduce themselves in an unusual way. They can grow into cancer. Sometimes this does not show up for many years.
This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the knowledge of the person at the time that damage has occurred. A person can be irradiated(放射治疗) and feel fine, then die of cancer five, ten, or twenty years later as a result. A child can be born weak or easy to get serious illness as a result of radiation absorbed by its grandparents.
1.According to the passage, the danger of nuclear power lies in .
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A.nuclear mystery |
B.radiation detection |
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C.radiation level |
D.nuclear radiation |
2.Radiation can lead to serious trouble even at the lowest level .
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A.when it kills a few cells |
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B.because the killed cells can’t be replaced |
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C.if it damages a few cells |
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D.unless the damaged cells can reproduce themselves |
3.What does the author want to tell us?
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A.Radiation can hurt us. |
B.Radiation is a subject scientists work on. |
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C.Radiation is a mystery. |
D.Radiation is the source of cancer. |
完型填空 (共20小题;每小题1分,满分20分)
A Fool’s Day falls on 1st of April. People _31_forget the significance (意义) of the day.
In March 1980, I was 32at Durham University with seven other Chinese students. I had 33 to go to another university after graduation and had 34 application (申请) forms to several 35 . Every morning I arrived at the porter’s office (传达室) and waited my fate. But no 36 came.
On April 1st, as I was eating my 37 , Huang came in , with a toothbrush(牙刷) 38 in his hand. 39 fearing that he might forget the important news , he passed me the 40 . “Morning , Wu,” he said , “I saw Mr. G this morning. He told me that a letter had arrived in his office for you from Manchester University, and asked you to go and get it 41 possible.” I jumped with 42 .
I even didn’t 43 my breakfast and rushed to Mr. G’s office but he wasn’t 44 . I then went to the secretary’s room and 45 everything to her. She opened Mr. G’s room. I looked at everything. There didn’t seem to be a letter for me. “If he had asked you to pick it up from here,” said the secretary , “ he would have put it in 46 or simply left it to me.”
Greatly 47 , I walked out of the room and 48 the secretary lock it. 49 the secretary’s eyes 50 . “Sorry,” she said. “It’s April Fool’s Day!”
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