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.
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S5. What may be a result of young people leaving their hometowns
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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