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应用文实战演练:正确的刷牙姿势

作者:teen
Aa
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Choose the answer:

1. It is best to brush teeth at a ________ angle to the gums.

A. 0-degree

B. 30-degree

C. 45-degree

D. 90-degree

2. It is best to brush the ________ back and forth.
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