单项选择题

A．similar
B．long
C．different
D．short
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单项选择题
What did the American Indians call the Indian summer
A．The god of the Southwest.
B．The god of the Northeast.
C．The god of the Southeast.
D．The god of the Northwest.
单项选择题
Why did the resistance of insects to man-made insecticides develop so rapidly
A．Insects can develop ways of dealing with man-made insecticides as they do with natural poisonous chemicals.
B．Insects can be smarter than they used to be.
C．Insects can attract their mates to the same plant.
D．Insects will be attracted to farmers’ crops in a time during a year.
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