When food and germs collect in a small crack , our teeth________

Câu hỏi :

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

A. send poison into the blood

B. begin to decay

C. become hard 

D. make us feel quite ill

* Đáp án

* Hướng dẫn giải

Đáp án là B

Ý trong bài: The decay begins in a little crack in the enamel (men răng) covering of the tooth. This happens after germs and bits of food have collected there then the decay slowly spreads inside the tooth.

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