With this sensitive machine, we can find the ______ of a milligram of aspirin in an Olympic-size swimming pool.

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问题 With this sensitive machine, we can find the ______ of a milligram of aspirin in an Olympic-size swimming pool.

选项 A、counterpart
B、equivalent
C、average
D、installation

答案B

解析 counterpart:同等地位或作用的人或机构;equivalent:对应词,等量物,等价物;average:平均量;installation:安装
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