Harry Potter is mentioned in the passage, because scientists What does the word "coaster" mean in the passage?

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问题 Harry Potter is mentioned in the passage, because scientists
What does the word "coaster" mean in the passage?

选项 A、A disk or plate placed under a drinking glass to protect a table top.
B、A vessel engaged in coastal trade.
C、A roller coaster.
D、A resident of a coastal area.

答案A

解析 第四段第一句告诉我们,科学家的这个隐形装置和一个杯垫差不多大小,所以A是正确选择。coaster是一个多义词,其他几个选择是该词的其他意思,B:从事沿海贸易的船;C:过山车,摩天轮;D:海岸地区居民。
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