填空题

A be costly
B be harmful
C save a life
D still open to debate
E reduce the risk of radiation triggering a cancer
F reduced to the minimum
Advantages of screening women under 50 are ______.

【参考答案】

D
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单项选择题
Ronald Kahn and his colleagues can make mice live longer by（）。

A. offering them less food.
B. giving them a balanced diet.
C. disrupting the specific genes in their fat cells.
D. preventing them growing larger.
单项选择题
51().

A. made
B. did
C. took
D. got
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