单项选择题

A．It helps the body to digest food.
B．It keeps milk fresh.
C．It helps the body to absorb calcium.
D．It prevents sunburn.
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单项选择题
A．Electric cars. B．Increasing fuel efficiency. C．California’s pollution laws. D．Automobile safety.
A．Electric cars.
B．Increasing fuel efficiency.
C．California’s pollution laws.
D．Automobile safety.
单项选择题
A．He drives too fast. B．His radio wakes her children up. C．He plays his guitar too loudly. D．His friends are too noisy.
A．He drives too fast.
B．His radio wakes her children up.
C．He plays his guitar too loudly.
D．His friends are too noisy.
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