单项选择题

Questions 11～14 are based on the following conversation. Why doesn’t Mary want to give up her apartment

A．She will have trouble finding another one.
B．She finds it in a very good location.
C．Her landlord plans to lower its rent.
D．She doesn’t have time to move.
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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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