单项选择题


What does the weather forecast probably say about this weekend

A．It will remain cloudy.
B．It will stay nice.
C．It is going to rain.
D．It is going to snow.
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单项选择题
According to the first paragraph, the atmosphere is essential to man in that ______.
A．it protects him against the harmful rays from space
B．it provides sufficient light for plant growth
C．it supplies the heat necessary for human survival
D．it screens off the falling meteors
单项选择题
Dr. Nelson has drawn a conclusion that ______.
A．the findings of animals’ resistance to cancer can be applied to human cancer treatments
B．the length of exposure to light can affect the growth of a tumor
C．there is a relation between the length of the day, the animals’ immune system and cancer
D．there is a new approach for studying the function of central nervous system in the body’s immune system
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