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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单项选择题
Protestors claimed it was wrong to fire Matthew Cusick because he was （）

A．a very good acrobat
B．not sick.
C．unable to find other work
D．HIV positive
单项选择题
If you need a transfusion, the best and safest blood for you is （）

A．type AB
B．exactly the same type as yours
C．a mixture of salt, plasma and type O
D．type A
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