下列关于艾滋病的说法，错误的是（）
A.艾滋病毒破坏B淋巴细胞，使人体免疫系统瘫痪
B.艾滋病主要通过性接触、血液和母婴三种途径传播
C.HIV病毒侵入人体后与T淋巴细胞相结合，破坏T淋巴细胞
D.HIV病毒侵入人体后，使人体发生多种无法抵抗的感染和肿瘤，导致死亡
参考答案：A
解析：艾滋病病毒破坏的是T细胞，故A错误。艾滋病主要通过性接触、血液和母婴传播，故B正确。HIV病毒侵入人体后与T淋巴细胞结合，破坏T细胞，故C正确。HIV病毒侵入人体后，使人免疫力降低甚至丧失，故D正确。考点：本题考查艾滋病相关知识，意在考察考生对知识点的理解掌握程度。
Being alone in outer space can be __36__. That is one reason why astronauts on solo space flights were given plenty of work to keep them 37 . They were also in constant communication with people on the earth. 38 , being with people from whom you cannot get away might be even harder than being alone. This is what happens on long submarine(海底)voyages. It will also happen on 39 space flights in the future. Will there be special problems of adjustment under such conditions? Scientists have studied the reactions of men to one another during long submarine voyages. They have also found that the longer the voyage lasts, the more serious the problem of 40 is. When men are 41 together for a long period, they begin to feel 42 . Everyone has little habits of speaking and behaving that are ordinarily acceptable. In the limited space over a long period of time, however, these little habits may become very_ 43 . Apparently, although no one wants to be 44 all the time, everyone needs some degree of privacy. When people are enclosed together, they are in what is called stress situation. That means that they are under an unusual amount of 45 or stress. People who are well-adjusted are able to 46 stress situations better than others. That is one reason why so much care is taken in 47 our astronauts. These men undergo a long period of testing and training. One of the things tested is their behavior under stress, and thus they can do better than ordinary people.
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