3．As is well-known，the environment in China is badly in need of improvement．

分析 眾所周知，中國(guó)的環(huán)境很差需要改善．

解答 43．As，此題是由as引導(dǎo)的非限制定語(yǔ)從句，as指代的是后面整個(gè)主句the environment in China is badly in need of improvement．

點(diǎn)評(píng) 對(duì)于首字母填空這種題，要分析句子意思，再?gòu)慕Y(jié)構(gòu)上和意義上對(duì)答案進(jìn)行確定．

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