单项选择题

How many countries were stricken in the disaster

A．12
B．21
C．11
D．31
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A．installsB．poursC．flowsD．inserts
A．installs
B．pours
C．flows
D．inserts
单项选择题
Sucking proves effective only______.
A．when a patient is bitten by a fatal snake
B．when a child is not seriously injured
C．when other medical treatments fail
D．when parents are helpless
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