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【单选题】
手足搐搦、婴儿牙釉质发育不良以及母体骨质软化症。A.
钙
B.
锌
C.
铁
D.
维生素D
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反馈参考答案：
举一反三
【简答题】五味子的有效成分
【单选题】The question set by the teacher was so difficult that the pupils did not know how to it.
A.
handle
B.
cope
C.
tackle
【单选题】The question was so ________ that there was a ________ expression on the teacher's face.
A.
puzzled; puzzling
B.
puzzled; puzzled
C.
puzzling; puzzled
D.
puzzling; puzzling
【单选题】The question was so difficult that the pupils didn't know how to __it.
A.
do
B.
deal
C.
manage
D.
tackle
【单选题】The question was so difficult that （） people could answer it.
A.
little
B.
afew
C.
few
【单选题】The question was so unexpected that I was ________for a moment.
A.
on balance
B.
out of balance
C.
in the balance
D.
off balance
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