单项选择题


A．involved
B．included
C．forced
D．joined
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单项选择题
A．whatB．whenC．howD．that
A．what
B．when
C．how
D．that
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
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