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
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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
The mob marches down the street ________ a large heavy log.
A. carry
B. carries
C. carrying
D. carried