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单项选择题


In this section, you will hear several news items. Listen to them carefully and then answer the questions that follow.
Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
Now, listen to the news.

The handle of the nanobrush is ______.
A．thicker than a human hair
B．thirty billionths of a meter across
C．a few millionths long
D．relatively smaller than the brush
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