单项选择题

A．Insects Out of Control
B．An Urgent Challenge in Agriculture
C．How to Use Insecticides Properly
D．Insects and Insecticides
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单项选择题
A．A bus station.B．An airport.C．A super highway.D．A train station.
A．A bus station.
B．An airport.
C．A super highway.
D．A train station.
单项选择题
A．Insects would be out of control some day if nothing were done about the present situation.B．Insects will some day eat all green vegetables on earth.C．Insects are the most adaptable creatures.D．Insects have developed resistance to both botanical and artificial poisons rapidly.
A．Insects would be out of control some day if nothing were done about the present situation.
B．Insects will some day eat all green vegetables on earth.
C．Insects are the most adaptable creatures.
D．Insects have developed resistance to both botanical and artificial poisons rapidly.
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