填空题

Hazardous wastes have to be treated before being dumped into landfilis.

【参考答案】

NG

<上一题目录下一题>

热门试题

填空题

In the United States the building of landfilis is the job of both federal and local governments.

填空题

Landfilis are like compost piles in that they speed up decomposition of the buried trash.