听到问题后，必须从A、B、C、D四个选项中选出最佳选项。

After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.

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每题都有对应标记的A、B、C和D四个选项，请选择最佳选项并在答题卡2的相应字母中间划横线。

For each of them there are four choices marked A, B, C and D. You should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a single line through the centre.

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我们也强调这四个选项的利弊。

We also highlight the pros and cons of these four options.

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So we have four choices in terms of initial and final energy levels, and also what it means - in terms of the electron -- whether it's gaining energy or whether it's going to be emitting energy?

我们有这四个选项,各有不同的初始能量和末能量,它都是按照电子来说的,不管是失去能量还是得到能量？

麻省理工公开课 - 化学原理课程节选

So this is what he asked them to do: Select four answers to the question 'What should a reader be to be a good reader?' "The reader should belong to a book club."

这就是他要求学生们做的：,从以下四个选项中选取问题,“读者如何才能成为好读者”的答案：,“读者应该是书友会的成员“

耶鲁公开课 - 1945年后的美国小说课程节选