单项选择题

Mathematics is still the necessary （） for the management of nature.

A．implement
B．implication
C．illustration
D．appliance

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单项选择题
We'll have to get out and call a taxi; my car's （）.

A．broken down
B．cut down
C．pulled down
D．run down
单项选择题
If two countries are at war and a third country chooses not to take sides, the third country may declare itself （）.

A．middle
B．central
C．neutral
D．intermediate
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