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图示结构中，AC杆将发生的变形为（）。 A. 弯曲变形 B. 弯曲与压缩的组合变形 C. 弯曲与扭转的组合变形 D. 弯曲与拉伸的组合变形

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Brushing removes larger particles, but dentists suggest brushing the back of the tongue as well, where food residues and bacteria ________. （）

A．gather
B．collaborate
C．congregate
D．collect

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Which of the following statements is true about paraphrasing according to this video?
A、We cannot use more than two methods even though we are 100% sure.
B、We shouldn't replace the words with similar meanings.
C、We should use all the methods we’ve learned even though we are not 100% sure.
D、We can use one method only in each sentence.