题目内容

Questions 18--21 are based on the following passage. Why were insects and rats dangerous

A. Destroyed.
B. Carried disease.
C. Made the water impute.
D. Ruined the soldier’s clothin

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A. Disease.
B. The Greatest Danger.
C. Insects, Rats, and Gunshot Wounds.
D. The History of Epidemics.

A. On the sports page.
B. In the world news section.
C. On the editorials page.
D. On the financial pag

A. 对
B. 错

A. Boss and secretary.
B. Client and lawyer.
C. Teacher and student.
Doctor and nurs