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题型说明：每题所设选项中只有一个正确或最符合题意的答案。 21. (2.0分) The sun () in the east and () in the west.A. rise; setB. rises; setsC. rose; setD. is rising; is setting

题型说明：每题所设选项中只有一个正确或最符合题意的答案。 21. (2.0分) The sun () in the east and () in the west.

A. rise; set

B. rises; sets

C. rose; set

D. is rising; is setting

题目解答

答案

B. rises; sets

解析

本题考查主谓一致和动词时态的正确使用。

主谓一致：主语“the sun”是第三人称单数，动词需用单数形式。
动词时态：描述自然规律（如“太阳东升西落”）时，通常使用一般现在时，强调客观事实的重复性。

选项分析

选项A: rise; set

错误原因：动词未加单数第三人称后缀-s，不符合主谓一致规则。

选项B: rises; sets

正确性：动词rises和sets均为单数第三人称形式，符合主谓一致；一般现在时表示自然规律的客观性，正确表达“太阳东升西落”。

选项C: rose; set

错误原因：使用过去式，但题目描述的是当前客观规律而非过去发生的事情。

选项D: is rising; is setting

错误原因：现在进行时表示动作正在发生，而自然规律是持续性的客观事实，需用一般现在时。

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