单选题
The purpose of the experiment conducted by the scientists is to ______.
A、
win a gradual victory over death and aging
B、
extend a person's life when he has an incurable disease
C、
bring youth back to a person when he becomes very old
D、
find a way to cure incurable diseases such as AIDS
【正确答案】
A
【答案解析】
[解析] 见第五段中What we are looking at is a gradual victory over death and aging…
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