解析：Questions 18--21 are based on the_考试试题_公共英语

【单选题】Questions 18--21 are based on the following passage.
Why were insects and rats dangerousA．DestroyeD、
B．Carried disease.

C、Made the water impute.
D．Ruined the soldier’s clothin

网考网参考答案：B
网考网解析：
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