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【单选题】
绝骨质疏松发生的主要原因是（）A.
年龄的增大
B.
孕激素减少
C.
雌激素减少
D.
不确定
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【简答题】What is the good news for scientists? [A] The underground oil resources have not been affected. [B] Most of the desert animals and plants have managed to survive. [C] The oil lakes soon dry up and sto...
【单选题】Nowadays, good babysitters are in great _____, so many companies have been set up to train good babysitters. [ ]
A.
request
B.
need
C.
demand
D.
requirement
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