单项选择题

What causes Indian summer

A．Chilly tropical air.
B．Warm tropical air.
C．Wintry tropical air.
D．Cool tropical air.
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单项选择题
What have scientists discovered about plants and insects
A．Plants produce many poisonous chemicals for defense against insects.
B．Insects develop ways of dealing with natural poisonous chemicals but not man-made ones.
C．Farmers must spray plants all the time.
D．Farmers must use different brands of insecticides.
单项选择题
A．displayingB．describingC．creatingD．exchanging
A．displaying
B．describing
C．creating
D．exchanging
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