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【单选题】
关于病毒与肿瘤发生的关系,哪项组合是 错误 的A.
EB病毒-鼻咽癌
B.
病毒-肺癌
C.
乙型肝炎病毒-原发性肝癌
D.
人乳头瘤病毒-宫颈癌
E.
人嗜T细胞病毒-白血病
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【简答题】完形填空。 In many countries old age is a happy time, but in the United States it is quite 1 for old people. Most old people do not live with their children or relative. If they 2 enough money, they buy ho...
【单选题】A man has to make ______ for his old age by putting aside enough money to live on when old.
A.
supply
B.
assurance
C.
provision
D.
storage
【单选题】It is true that______.
A.
old age is the worst age
B.
only old people are able to give wise advice
C.
a wise old man may live happily
D.
an old man who has joined in battles can live happily
【单选题】The passage is mainly about ______.
A.
the effects of old age on health
B.
old people
C.
people's fear of getting old
D.
old people's diseases
【单选题】A man has to make ______ for his old age by putting aside enough money to live on when old.
A.
supply
B.
assurance
C.
provision
D.
adjustment
【简答题】周围神经系统的髓鞘形成细胞是（），中枢神经系统的髓鞘形成细胞是（）。
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