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

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

What does the passage mainly discuss （）

A．The changes of soccer.
B．The rules of rugby.
C．Different village players.
D．The birth of American football.