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【单选题】
两偏振片紧贴着放在一的前面,此时没有光透过。当其中一片转过 时,将观察到A.
透射光光强先增强，然后减弱，最后又增强
B.
透射光光强在整个过程中都逐渐增强
C.
透射光光强先增强，然后又减少到零
D.
透射光光强先增强、然后减弱，又再次增强、然后减弱
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【单选题】Britain has recently had a high level of unemployment, but the same is true _____ many other countries. [ ]
A.
at
B.
from
C.
of
D.
to
【单选题】How would you describe the weather in picture A
A.
stormy
B.
sunny
C.
sandy
D.
typhoon
【简答题】A．Do much research in many fields of science. B．Understand people in other countries better. C．Both A and B． D．Neither A nor B．
【单选题】How would you describe the weather in picture A
A.
miserable
B.
cold
C.
excellent
D.
snowy
【单选题】( )6.In many countries ,it is not good manners for a person to talk with his mouth____.
A.
filled
B.
empty
C.
crowded
D.
full
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