单项选择题

A．Four days.
B．For days.
C．Four weeks.
D．For weeks.
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单项选择题
What can we infer from this discussion
A．That Bob does not get along with his lab partner.
B．That the students performed the experiment correctly.
C．That the students had problems, and could not complete the lab experiment.
D．That there was a fire in the lab during the experiment.
单项选择题
What conclusion can be drawn from the scientists’ observation
A．Insects have developed some sort of resistance to man-made poisons.
B．Insects have been eating plants for about 250 million years.
C．Farmers sometimes use a combination of two or three insecticides at once.
D．New insects mate with insects which survived from a certain kind of insecticide.
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