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
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单项选择题
The main topic of the passage is ______.
A．busy work and poor parenting
B．parenting and school education
C．poor parenting and where it occurs
D．the spread of violence in schools
单项选择题
One reason parents refuse to reply to the school about their child's problems is that______.
A．they are too busy to handle the problems
B．they think the school is responsible for the problems
C．they are too tired to handle the problems
D．they think the school is hostile to them
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