2. 外语
  3. All matter is made up of atoms; _______, it is made up of nuclei with electrons whirling around them.

All matter is made up of atoms; _______, it is made up of nuclei with electrons whirling around them.

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问题 All matter is made up of atoms; _______, it is made up of nuclei with electrons whirling around them.
选项 A、that is
B、on the contrary
C、in short
D、on the other hand
答案A
解析 短语意义辨析。A. that is也就是说，即；B．on the contrary相反地；C. in short简而言之；D．on the other hand另一方面，常与on one hand连用。根据题意和逻辑应选A。句意为：所有的物质都是由原子构成的，也就是说，它是由原子核和围绕着原子核旋转的电子构成的。
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大学英语六级

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