题目内容
（请给出正确答案）
[主观题]
According to Ames, which of the following can be inferred about man-made carcinogens？A．The
According to Ames, which of the following can be inferred about man-made carcinogens？
A．They are no more harmful to people than a peanut-butter sandwich.
B．They are more harmful to people than a peanut-butter sandwich.
C．They are as harmful as a peanut-butter sandwich to people.
D．No definite conclusions have been made about them.
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