When food and germs collect in a small crack, our teeth ________ A. become hard

Câu hỏi:

When food and germs collect in a small crack, our teeth ________

A. become hard

B. send poison into the blood

C. begin to decay

D. make us feel quite ill

Trả lời:

Chọn C

Dẫn chứng “The decay begins in a little crack in the enamel covering of the tooth.”

Câu 1:

“Why don't we go out for a walk?” said the boy.

=> My father suggested __________________________.

Câu 2:

Điền giới từ: He gets a lot of gifts ________ Christmas.

Câu 3:

Some of my _________ live in the city. (relate)

Câu 4:

I was surprised when I discovered the truth (find).

=> _____________________________.

Câu 5:

A lot of people visit the dentist only when ________

Câu 6:

We ought to clean our teeth ________

Câu 7:

We shouldn’t eat a lot of ________

Câu 8:

In the story, the _____ fox outwits the hunters.

600 Bài tập trắc nghiệm Tiếng Anh 12 mới