单项选择题

According to the passage, movement occurs when a muscle______.

A．grows
B．shortens
C．relaxes
D．pushed
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单项选择题
One possible reason why women have better memories than men is that______.
A．they have a wider range of interests
B．they are more reliant on the environment
C．they have an usual power of focusing their attention
D．they are more interested in what's happening around them
单项选择题
What is the passage mainly about
A．The process of gradual memory loss.
B．The cause of absent-mindedness.
C．The impact of tile environment on memory.
D．A way of encoding and recalling.
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