反饋信息: 北京師范大學出版社 - 訪問網站 
北師大版第20單元第三課教材有誤:在PIONEERS OF SCIENCE第三段至后一句中,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的后面。
在第四段至后一句話中,。。。which proved that the universe was vastly larger than had previously been thought 。很明顯than的后面少了一個that 。
在課文的至后一段中,。。。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,定語從句中多了一個it 。
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