15．The average Swiss live to 83，and there is evidence ____ it is their behavior，not anything else，_____ allows them to live longer．（　　）
A．that； thatB．that； whichC．that； thatD．whether； which

分析 瑞士人的平均壽命是83歲，有證據(jù)表明是他們的行為而不是其他的東西讓他們活的更久．

解答 答案：C
分析句式可知，there is evidence后接一個同位語從句，作為證據(jù)的內容，從句中是一個強調句式，whether意思是否，放在句子里不符合語境，所以只能用that來引導該同位語從句；第二空是強調句型，即it is+被強調部分+that…所以答案為C．

點評 考生需掌握同位語從句以及強調句在句子里的使用情況，并根據(jù)具體語境靈活使用．

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