What's the talk mainly about？
A. The reason for the popularity of parrots.
B. The way to teach parrots to talk.
C. The advantage of keeping a parrot at home.
D. Parrots are more easily to take care of.
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It can be concluded from the last paragraph that ______.
A. acting is a quick road to success
B. forty percent of Broadway actors have nothing to do
C. acting is highly competitive
D. if you wait, you will get the chance
一束右旋圆偏振光，从空气垂直入射到玻璃上，其反射光变为左旋圆偏振光。
A. 正确
B. 错误
A．What clothes to wear.B．Which cinema to go to.C．Whom to go with.D．Which restaurant to
A. What clothes to wear.
B. Which cinema to go to.
C. Whom to go with.
D. Which restaurant to go to.
Parents worry about violence on television because it may convince children that violence
A. True
B. False
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