【简答题】For days, Beijing has been trapped under a blanket of yellow-brown dust that the U.S. Embassy air monitor classifies, in its hourly reading, ' hazardous.' Living under Beijing skies, one【M1】______ has...
【简答题】The quality of water supply in southern Beijing has been improving in recent years, an official said. In addition to improvements in the network of pipes, the government has been upgrading three recyc...