（）is a friend and biographyer for Samuel.

Today，i’d like to talk about some of the changes land can undergo，especially desertification，a process through which land becomes part of desert.The underlined word “desertification”means（）.

A.扩大
B.固化
C.沙漠化
D.平整的

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The twin sisters were identical （）appearance and character.

A.of
B.with
C.in
D.to

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