单选题
We find it hard to break free from ideas connected with living on the earth because
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.
【正确答案】
B
【答案解析】
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