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【单选题】
下列化合物中,没有变旋光现象的是A.
果糖
B.
葡萄糖
C.
半乳糖
D.
蔗糖
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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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