题目内容

A．to waitB．waitC．waited

A. to wait
B. wait
C. waited

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Why was silk liked by people？

A. Because it was strong.
Because it was cheap.
C. Because it was expensive and only nobles could wear clothes made by silk.
D. Because it was like iron.

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A．to waitB．waitC．waited

A. to wait B. wait C. waited

Why was silk liked by people？

血友病乙E．

检验两样本所在总体的方差是否相等时，应选择的统计方法是E．

血清脂肪酶在发病后24小时升高的是E．

A. to wait
B. wait
C. waited