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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.
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.
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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