单项选择题

The brain works much more efficiently when（）.

A．both sides of the brain are used equally
B．the left side is fully developed
C．scientists work on it
D．the fight side is fully developed

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单项选择题
Right now the California Air Resources Board requires that a percentage of new cars sold should be free of emissions. What is that percentage（）

A．1%.
B．5%.
C．10%.
D．100%.
填空题
57（）
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