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    We are so used to our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted. Because we can feel that things are heavy， we think of “weight” as being a fixed quality in an object， but it is not really fixed at all. If you could take a one-pound packet of butter 4， 000 miles out from the earth， it would weigh only a quarter of a pound.
    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.
    【正確答案】 B
    【答案解析】 答案選B.本題抓住問題的關鍵詞break free from，“擺脫”的意思。We are so used to our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted.這是第一句話，so……that，如此…以至于。be familiar with與be used to是同義替換，前者表示熟悉…，后者表示習慣…，所以答案就得出來是B.