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.
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。
During the pause, you must read the four choices marked a, b, c and d, and decide which is the best answer.
在中止的时候，你一定读了四被作记号的选择一，B，c和d，而且决定最好答案是哪一。
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