Question

(   ) 4. At first，the speaker was referring to the problem of pollution in the country but halfway in his speech, he suddenly        to another subject.

A. committed    B. switched    C. attached    D. transmitted

Answer 1

4. B考查动词词义辨析。commit犯罪,保证(做某事、遵守协议或遵从安排等) ；switch转变，转换；attach附上，把……归因于；transmit传输，传染，发送信号。switchto转移到。句意：开始时，讲话者在谈那个国家的污染问题，但在讲话中途，他突然转到了另一个话题。