【題目】—Sorry, I don't know how many colours there are in a rainbow.

—Are you joking? This is just ________ knowledge.

A.naturalB.generalC.properD.ancient

【答案】B

【解析】

句意：——對不起，我不知道彩虹有多少種顏色。——你在開玩笑嗎？這只是常識。

考查形容詞辨析。natural自然的；general普遍的，總的， 常規(guī)的；proper正確的，恰當?shù)模?/span>ancient古代的，古老的。general knowledge：常識。根據(jù)常識可知“彩虹有7種顏色”，結(jié)合上文“我不知道彩虹有多少種顏色”可知此句是“你在開玩笑嗎？這只是常識。”故選B。

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