单项选择题

A．The high temperatures required for its use.
B．The lack of trained environmental engineers.
C．The opposition of automobile manufacturers.
D．The high cost of materials used in its production.
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单项选择题
A．He did a good job in mathematics.B．Mathematics made him a smart person.C．He majored in biology in college.D．He didn’t like mathematics at all.
A．He did a good job in mathematics.
B．Mathematics made him a smart person.
C．He majored in biology in college.
D．He didn’t like mathematics at all.
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