Plastics are warm materials, sympathetic to the human touch, and their transformation ______things that come into contact with h

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问题 Plastics are warm materials, sympathetic to the human touch, and their transformation ______things that come into contact with human beings is entirely appropriate.

选项 A、of
B、by
C、into
D、for

答案C

解析 transform sth.into sth.是动词transform的固定用法,其名词形式transformation也是同样,故只能选into。
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