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2013-04-01反饋信息: 北京師範大學出版社 - 訪問網站 
北師大版第20單元第三課教材有誤：在PIONEERS OF SCIENCE第三段至後一句中，Einstein then showed in his "theory of relativity" that not even time ,mass or length are constant----they change according to our experience of them.很明顯not的位置不對，not應該放在are的後麵。
在第四段至後一句話中，。。。which proved that the universe was vastly larger than had previously been thought 。很明顯than的後麵少瞭一個that 。
在課文的至後一段中，。。。the world as we know it today would have been a completely different place .很顯然，as是定語從句的引導詞，指代the world,定語從句中多瞭一個it 。
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