[填空题]metal or stone  ( ), or is ( ), it is gradually destroyed by a chemical or by rust.

A
corrodes
B
corroded
正确答案:A,B
题目解析
从“metal,stone”和“gradually destroyed by a chemical or by rust”可以看出两个空格处应填入表示“腐蚀”意义的词,第一个空是主动语态,故为“corrode”,第二个空是被动语态,故为“corroded”。
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