题目内容

It is a great example of ______ (recycle).

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Look at the sky. It is so _________ (dust).

They want to do something about environment _______ (protect).

Put up ______ (education) posters around the school.

紫杉醇属于 ( )

A. 单萜
B. 倍半萜内酯化合物
C. 二萜
D. 三萜