单项选择题

23（）

A．collect
B．pile
C．raising
D．increase

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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

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%.