题目内容

当一轴晶的有色宝石的o光和e光具有不同的颜色时为二色性

A. 对
B. 错

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要用二色镜观察宝石的多色性，待测样品一定要有色、透明、具有双折射率的宝石

A. 对
B. 错

We _______ the airport at 5 o'clock.

A. arrive
B. leave from
C. depart from
D. get

Stockton and his son put all the stuff up ________ this doorin case the people outside break into the shelter.

A. against
B. back
C. forward

I put the letter somewhere, but I can't ___________ now.

A. get my hands on
B. get my hands on it
C. find
D. find out