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

Approximately how many electric cars are now on California roads（）

A．200
B．2,000
C．20,000
D．200,000

单项选择题

The main idea of the above article is （）

A．Happiness means the same to everyone
B．Happiness is the thing that everyone wants most of all
C．Money makes one happy, so does helping others
D．Both A and C