单项选择题


Questions 17～20 are based on the following talk.
According to the speaker, how do some pesticides get into ponds

A．They are applied to aquatic weeds by fish farming.
B．Amphibians release them from their skin.
C．Irresponsible dispose of them in ponds.
D．They are washed into ponds by the rain.
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单项选择题
Researchers in behavioral psychology are divided with regard to______．
A．how dreams are modified in their courses
B．the difference between sleep and wakefulness
C．why sleep is of great benefit to memory
D．the functions of a good night’s sleep
单项选择题
To audience, the typical American astronaut______.
A．has a limited vocabulary
B．is a clean-cut, cheerful and frank guy
C．can’t understand a sophisticated joke
D．is well-built but rather slow-witted
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