单项选择题

A．Families with cars.
B．Americans’ heavy dependence on cars.
C．Roads and highways.
D．Traffic problems in America.
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填空题
Scientists will have to ______________ (提出提高世界粮食供应量的新方法).
单项选择题
A．He hates to pack.B．He doesn’t like to restrict his diet.C．He feels rushed.D．He’s worried about his lecture.
A．He hates to pack.
B．He doesn’t like to restrict his diet.
C．He feels rushed.
D．He’s worried about his lecture.
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