【简答题】阅读题: A company in San Francisco , California , has found a way to turn used plastic bottles into women's shoes . Every day , millions of Americans drink water and other liquids from plastic bottles . ...
【单选题】The United States Environmental Protection Agency and the State of Hawaii have launched a project to turn human waste products into paving asphalt and to extract useful fuel oil in the process. The pr...
B.
Sewage processing plants.
D.
Discarded building materials.
【判断题】The synthetic products may be toxic to the environment when they turn into waste .
【单选题】在设计教室时,前排边座的学生与黑板远端形成的水平视角应大于等于( )。