单项选择题

A．Because people have to spend too much time and energy to produce it.
B．Because too much grain protein is needed to produce it.
C．Because it contains too much fat and protein.
D．Because it is not good to the healt
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单项选择题
A．Our brain contract as we grow old.B．One part of the brain does not contract.C．Sixty-year olds have better brains than thirty-year olds.D．Some people’s brains have contracted earlier than other people’s.
A．Our brain contract as we grow old.
B．One part of the brain does not contract.
C．Sixty-year olds have better brains than thirty-year olds.
D．Some people’s brains have contracted earlier than other people’s.
单项选择题
A．In spring.B．In summer.C．In autumn.D．in winter.
A．In spring.
B．In summer.
C．In autumn.
D．in winter.
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