This passage is intended for someone who ______ . To see whether there is leak of air, you should first ______ .

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问题 This passage is intended for someone who ______ .
To see whether there is leak of air, you should first ______ .

选项 A、pump some air into the tube
B、replace the tyre
C、examine the valve
D、check the wheel

答案C

解析
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