题目

—Why do English people talk so often about the weather when they start a conversation?  —Well, it’s probably because the weather is a(n)________ topic. A. safe           B. sensitive       C. amazing        D. ordinary 答案：A 与610°角终边相同的角表示为 [　　] A．k·360°＋230° B．k·360°＋250° C．k·360°＋70° D．k·360°＋270°(其中k∈Z)