单项选择题


A．what
B．when
C．how
D．that
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单项选择题
The citing of dangerous effects of pesticides on laboratory animals in paragraph 3 is used to suggest that ______.
A．scientists are also concerned with the effects of pesticides on animals
B．cancer is the worst effect of the pesticides
C．most or all of the dangerous effects of pesticides are now known
D．the chemicals may also cause these effects in humans
单项选择题
Children are more likely than adults to suffer the negative effects of pesticides because ______.
A．children absorb more pesticides than adults, proportionally
B．pesticides are used more in areas with children
C．the pesticides used in schools are more dangerous than other pesticides
D．adults know more about pesticides than children
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