单项选择题

What is the largest energy source in the US today.（）

A．Nuclear energy.
B．Coal.
C．Oil.
D．Natural gas.

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When did the man set up his own company.（）
单项选择题
How many students are now studying at home-schools.（）

A．Two million.
B．A few thousand.
C．Twenty thousand.
D．Three million.
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