221. There are 5 ________ in the passage about nanometer(纳米) technology we have just read. Please te

题目简介

221. There are 5 ________ in the passage about nanometer(纳米) technology we have just read. Please te

题目详情


221. There are 5 ________ in the passage about nanometer(纳米) technology we have just read. Please tell me the general meaning of the first one.
A.personsB.paragraphsC.articlesD.Units
题型:单选题难度:偏易来源:不详

答案

 B

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