2. 外语
  3. At first, the professor was talking about the problem of education, he suddenly ______ to another topic.

At first, the professor was talking about the problem of education, he suddenly ______ to another topic.

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问题 At first, the professor was talking about the problem of education, he suddenly ______ to another topic.
选项 A、switched
B、committed
C、favored
D、transmitted
答案A
解析 题型：词汇题。switch表示“打开”，比如：to switch the TV on开电视：to switch the radio off关收音机。还可以表示“转换，转变”，如：He switched the conversation from one subject to another.他转变话题。I used to cook on electricity, but I’ve switched to gas. 我过去用电烧饭，但现已换成用煤气了。commit则表示犯错误、犯罪等，比如：commit a crime, favor表示“喜欢、支持、关注”，如：favors bright colors偏爱亮色。transmit则表示“传输、传达”，如：Iron transmits heat。铁传热。
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