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．persons | B．paragraphs | C．articles | D．Units |
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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．persons | B．paragraphs | C．articles | D．Units |
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