单选题：The difficulty in constructing tall buildings in the 19th ce

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题目内容：

The difficulty in constructing tall buildings in the 19th century lies in_____． A．the shortage of money
B．the lack of a device to carry people upward
C．the backward technology
D．mountains taking up land space

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_____(5)．They say American women have fewer economic.

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The speed of the machine can be automatically regulated(B级)．

The speed of the machine can be automatically regulated(B级)．A．adjusted B．increas

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He expressed eofleeiTl that the ship might be in distress(B级

He expressed eofleeiTl that the ship might be in distress(B级)． A．despair B．troub

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You have to pay for excess(B级)luggage on a plane．

You have to pay for excess(B级)luggage on a plane．A．additional B．large C．heavy D．

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事业单位以货币资金对外投资时，可能会涉及下列哪些科目（　）。

事业单位以货币资金对外投资时，可能会涉及下列哪些科目（　）。 A．对外投瓷 B．银行存款 C．事业基金——一般基金 D．事业基金——投资基金

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