英语四级
A． The lack of air pressure.
B． The extremely hot or cold temperature.
C． Exposure to radiation.
D． An inadequately ventilated space suit.
【解题思路】四项均为名词短语，其中三项与太空中的独特条件-(air pressure，temperature，radiation)有关，可能考查宇航服的某种设计原理。
【解析】短文中提到，宇航服是太空生活所必需的，因为外太空是一个真空空间，没有任何重力和气压，如果没有防护的话，人体将会爆炸。故选A。
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