(A) sanitary 衛生的/公共廁所(B) mercurial 汞(C) noxious 有害的(D) unsoiled 未污染的
the air was full of acid and metallic aerosol particles
mercurial adj. 含水銀的;敏捷的;活潑的;易變的;水星的
28. The environment was ________ because..-阿摩線上測驗