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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单项选择题
Did the merchant know who had taken the umbrella()

A. Sure.
B. Not very sure.
C. Not at all.
D. Probably.
单项选择题
Those who are against uniforms believe that people wearing uniforms ()

A. are usually helpful
B. bare little freedom
C. lose personal character
D. enjoy greater popularity
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