单项选择题

The word "immortality" in the first paragraph most probably means ______.

A．long life span
B．mortality
C．death
D．never-ending life
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单项选择题
Which of the following can best describe the tone of the passage
A．Humorous.
B．Sympathetic.
C．Amusing.
D．Optimisti
单项选择题
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
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