单项选择题

We did not discover that his apprehension concerning our hypothesis was（）until well afterward, following a series of rigorous trials and revisions, at which point our experiment proved an unqualified success.

A.unfounded
B.alert
C.tenuous
D.logical
E.peremptory

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单项选择题

The primary purpose of the passage is to treat the potential correlation between environmental pollutants and carcinogenic effects in which of the following ways（）

A. Explicate the reasons it has been suggested
B. Suggest an alternative correlation
C. Examine its possible implications
D. Criticize the evidence used to support it
E. Present findings that qualifies it

单项选择题

The author mentions all of the following as factors which limit the persuasiveness of the evidence suggesting a link between environmental pollutants and cancer EXCEPT（）

A.The lack of study of the effects of pollutants on human health
B. Increased diagnosis rates
C. An increase in the worldwide breast cancer rate
D. A decrease in the worldwide uterine cancer rate
E. Geographical differences in cancer susceptibility