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 right side is fully developed

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单项选择题

Sam Wilson stamped the boxes of meat for the army with a large US for（）.

A．Uncle Sam
B．United States
C．Soldiers
D．America

单项选择题

Right now the California Air Resources Board requires that a percentage of new cars sold should be flee of emissions. What is that percentage（）

A．1%.
B．5%.
C．10%.
D．100%.

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