Mark the letter A, B, c, or D to indicate the correct answer to each of the following questions.

Câu hỏi

Vaccines are often used to prevent the _________ of diseases caused by viruses.

A. development

B. increase

C. decrease

D. spread

Đáp án
D. spread

Câu hỏi thuộc Bài tập:

E11-GS-Unit 1- Practice 4