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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单项选择题
In paragraph 1, ... student lending has increased in breadth as well as depth most likely means ______.
A．there are a greater number of student loans than before
B．student loans are for higher amounts of money than before
C．more total money is owed by students than before
D．there are more student loans than before and the total money owed is more than before
单项选择题
The author mentions the exaggerated effects of chemicals on children in paragraph 2 to ______.
A．prove that pesticides are dangerous to all humans
B．show that children are more susceptible to many kinds of dangers
C．suggest a solution to the problem of pesticides
D．identify one group that pesticides hurt in particular
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