2. 外语
  3. Xenon has a number of applications,______its use in flash lamps for high speed photography may be mentioned.

Xenon has a number of applications,______its use in flash lamps for high speed photography may be mentioned.

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问题 Xenon has a number of applications,______its use in flash lamps for high speed photography may be mentioned.
选项 A、among which
B、which
C、and which
D、each of which
答案A
解析 关系分句。此处是which引导的非限制性定语从句，因此，which前不能加连词and；另外从句句子结构完整，不缺主语和宾语，因此C和D不是正确选项；根据题意，后半句表达的内容只是氙气用途中的一种，所以应该加上among，表示“众多中的一种”因此选择A。
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