In our class, when the bell rang and the teacher closed his book, it was a _____

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问题 In our class, when the bell rang and the teacher closed his book, it was a _______for everyone to stand up.

选项 A、signal
B、chance
C、mark
D、measure

答案 A

解析本题考查词义辨析。signal信号，导火线；chance机会，运气；mark分数，标志；measure措施，办法，尺寸。又如：This is signal that you are breaking down．这是你身体逐渐变垮的信号。根据题意，因此选A。

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