单项选择题

Acrobats and gymnasts are in danger of hurting themselves in Cirque du Soleil performances because （）.

A．they haven’t practiced enough
B．the equipment is in need of repairs
C．they perform risky acts without nets
D．some are HIV positive

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填空题
A．understood B．took C．pollute D．rude
单项选择题
Mark Twain became famous in （）

A．Asia
B．the United States
C．Europe
D．both B and C
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