题目

When it    air pollution, Beijing faces the three “C” s-----cars，coal and construction，which lead to Beijing's thick air pollution． A．refers to        B．comes to          C．happens to         D．speaks to 答案：B读拼音，写词语。     xiōng dì    shāng rén    gòu mǎi    (      )        (      )        (      )  jià qián      pī píng       jué xīn (      )        (      )        (      )