单项选择题

A．The new technology used to build roads.
B．The ability to transport goods over land.
C．The trade in grain and cotton.
D．The linking of smaller local roads into one long road.
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单项选择题
A．Use them for business purposes only.B．Check all their answers.C．Substitute them for basic thinking.D．Be reasonably skeptical about them.
A．Use them for business purposes only.
B．Check all their answers.
C．Substitute them for basic thinking.
D．Be reasonably skeptical about them.
单项选择题
A．How spiders gather food.B．Why spider webs are so strong.C．How spider build their webs.D．How new kinds of structures might be designed.
A．How spiders gather food.
B．Why spider webs are so strong.
C．How spider build their webs.
D．How new kinds of structures might be designed.
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