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．John is more likely to develop lung cancer.B．Mary is more likely to develop lung cancer.C．John and Mary have the same chance to develop cancer.D．Neither John nor Mary has the chance to develop cancer.
A．John is more likely to develop lung cancer.
B．Mary is more likely to develop lung cancer.
C．John and Mary have the same chance to develop cancer.
D．Neither John nor Mary has the chance to develop cancer.
单项选择题
A．Florida.B．California.C．Nevada.D．Hannibal.
A．Florida.
B．California.
C．Nevada.
D．Hannibal.
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