专业英语四级（完形填空）模拟试卷546
完型填空
A. endurable B. protection C. exposed D. if E. until
F. extremely G. acts as H. decrease I. curable J. disaster
K. attributed L. danger M. effective N. before O. essential
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again【C1】________our protective blanket on earth. Light gets through, and this is【C2】________for plants to make the food we eat. Heat, too, makes our environment【C3】________.
Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are【C4】________to this radiation but their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage.
Radiation is the greatest known【C5】________to explorers in space. The unit of radiation is called \\
1.【C1】
G
解析：空格所在句缺少谓语，再根据全文的时态和主语The atmosphere，可知此处应填入动词的第三人称单数形式。备选项中acts as“充当，起……的作用”，符合句意，即大气层起到了地球保护毯的作用。
2.【C2】
O
解析：空格处应填入形容词、分词或名词，作表语。句中this指代“光线可以穿过大气层”这一点，而由常识可知，在植物进行光合作用生成人类所需的食物时，太阳光是不可或缺的。备选项中essential“必不可少的，非常重要的”符合句意。
3.【C3】
A
解析：使役动词makes可后接省略to的不定式、形容词或名词作宾语补足语。前面提到大气对地球的保护作用、光线对植物合成食物的重要性，此处应该是说来自太阳的热量对环境的好处。备选项中表积极意义的endurable符合句子语义，即热量也使得我们的环境不至于令人无法忍受。
4.【C4】
C
解析：根据下文“但如果他们穿着宇航服或待在太空船里，就能避免大量辐射造成的损伤”可知。前面说的是离开大气层就会受到辐射。备选项中exposed可与介词to搭配，构成be exposed to“暴露于”，符合语意。attributed虽然也可与to搭配，但填入句中语义不通．故不选。
5.【C5】
L
解析：定冠词the提示此处填入名词。大多数辐射对人是有害的，由此可首先锁定disaster、danger；再联系下文的“……人可以忍受远大于0.1雷姆的辐射而不受到损伤(damaged)”，由此说明“辐射”是一种“可能造成损伤的事物”而非灾难性的事物，danger符合句意。
6.【C6】
F
解析：空格所在句句子结构完整，推断此处应填入副词，修饰形容词difficult。由下文的要等到生下畸形的子女甚至是要等到生下孙子才会发现，可知要确定辐射的危害很难，extremely符合句意。
7.【C7】
E
解析：空格所在句讲什么时候发现辐射的危害。备选项中的介词until与否定词构成not…until“直到……才”结构，符合句意，故选E。
8.【C8】
B
解析：空格前的the和空格后的of提示此处应填入名词。由下文提到的“在太空实验室工作”，结合首段提到的“大气层……起到了地球保护毯的作用”，可知protection“保护，保卫”符合句意。
9.【C9】
H
解析：help (to) do sth．为固定搭配，空格处填入动词原形。通常来说药物可帮助减少损伤，备选项中decrease“减少”。符合句意。
10.【C10】
M
解析：空格处填入ones的限定语，可为形容词或分词。句中ones指代前面出现的drugs，空格所在句说的是治疗辐射造成的损伤的药物还没有找到，备选项中curable“能治愈的”修饰的对象是疾病而不是药物，故排除。effective“有效的”，通常指能取得预期或先见效果的，符合句意。
A. loss B. steep C. by contrast D. undergo E. yet
F. analogous G. likelihood H. do I. suffer J. acute
K. decline L. already M. conquer N. overcome O. vulnerable
At the age of twelve, the human body is at its most vigorous. It has【C1】________to reach its full size and strength, and its owner his or her full intelligence; but at this age the【C2】________of death is least.
Earlier, we were infants and young children, and consequently more【C3】________; later, we shall【C4】________a progressive loss of our vigour and resistance which, though imperceptible at first, will finally become so【C5】________that we can live no longer, however well we look after ourselves, and however well society, and our doctors, look after us. This【C6】________in vigour with the passing of time is called ageing.
Most animals we commonly observe in fact age
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