单项选择题

What has helped to reduce car accidents

A．Regular driver training.
B．Improved highway design.
C．Stricter traffic regulations.
D．Better public transportation.
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单项选择题
According to the text, the UK scientists have known that______.
A．women have more cells than men when they are born
B．women can replace the cells that enable the heart to beat
C．the female heart loses few of the cells with age
D．women never lose their pumping power with age
单项选择题
A．headedB．headC．headsD．heading
A．headed
B．head
C．heads
D．heading
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