填空题

A．water
B．term
C．flower
D．exercise

【参考答案】

D
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单项选择题
Why did one scientist expose birds to artificial daylight（）

A．To test the relationship between daylight and a disease of the glands common to birds.
B．To test the relationship between daylight and migration.
C．To test the relationship between migration and temperature.
D．To test the relationship between daylight and changes in the season.
单项选择题
The author states that birds left the tropics because （）

A．there was not enough food there in the winter
B．there were too many birds
C．there were too many glaciers
D．there was too much daylight
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