How much would four pounds of tea weigh if it was taken 4,000 miles out from the surface of the earth? We find it hard to break

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问题 How much would four pounds of tea weigh if it was taken 4,000 miles out from the surface of the earth?
We find it hard to break free from ideas connected with living on the earth because

选项 A、it demands too great an effort for us to do so.
B、we are too familiar with the way things are to question the ideas.
C、we have proved that those ideas are correct.
D、we are so sure of ourselves that we never doubt anything on the earth.

答案B

解析
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