单项选择题

"The twilight of their years" (Line 5, Para. 5) refer to______.

A．their old years
B．their young years
C．their good years
D．their bad years
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单项选择题
The difference in the sex-determining chromosomes is that______.
A．a woman inherits X chromosomes from her mother while a man from his father
B．a woman inherits Y chromosomes from her mother while a man from his father
C．a woman has an X and a Y chromosome while a man has two of them
D．a woman has two X chromosomes while a man has an X and a Y chromosome
单项选择题
The word their (Line 1, Para. 5) refers to ______.
A．the scientists'
B．men's
C．women's
D．young women's
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