The first paragraph mainly indicates that ______. The underlined word "filtering" in Paragraph 2 means ______.

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问题 The first paragraph mainly indicates that ______.
The underlined word "filtering" in Paragraph 2 means ______.

选项 A、passing
B、purifying by using a filter
C、motivating
D、encouraging

答案B

解析 语意题。filter意为“过滤”,可根据selecting猜测出此意,故选之。
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