单项选择题

A fireman discovered the () of the fire.

A. truth
B. reason
C. cause
D. fact

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单项选择题
What does the saying you can’t hear yourself think mean().

A. You have head trouble.
B. You are too stressed.
C. It’s very noisy.
单项选择题
Which lines are for the single().

A. The outside ones.
B. The inside ones.
C. The middle ones.
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