单项选择题

Scientists believe that the differences between boys and girls are determined by （）.

A．their personal abilities
B．their physical condition
C．their courage and independence
D．their age and sex

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单项选择题
Why did Elizabeth say to her father, But, Dad, you can t be healthy if you re dead （）

A．He was driving at great speed.
B．He was running across the street.
C．He didn"t have his safety belt on.
D．He didn"t take his medicine on time.
单项选择题
1（）

A．memory
B．thought
C．knowledge
D．experience
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