题目
A.组成部分
B.腐蚀
C.合成
D.侵蚀
第2题
A.corrode
B.cooperate
C.coexist
D.coincide
第4题
A..cooperate
B.construct
C..corrode
D.collapse
第5题
______ the surface of metal, but also weakens it.
A.Not only does rust corrode
B.Not only rust corrodes
C.Rust not only corrodes
D.Rust, which not only corrodes
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