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%.

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单项选择题

When I am a boss, I will no longer have to search for this thing. This sentence means（）

A. when I have power, I will have happiness
B. being a boss is more important than feeling happy
C. when I become a boss, I will never search for happiness
D. boss and this thing mean the same to boss and I

单项选择题

24()

A.less
B.more
C.fewer
D.lessen