单项选择题

When did Michael Schwabe say goodbye to the gas pump（）

A．Two days ago.
B．Two months ago.
C．Two years ago.
D．Ten years ago.

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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%.
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
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