雨期填筑路堤需借土时,取土坑距离填方坡脚不宜()m。
A.<1
B.<3
C.>1
D.>3
参考答案:B
The public ______ of the environmental problem will make the government take it seriously.
A.existence
B.revolution
C.awareness
D.evidence
烟草中含有的主要有害成分有哪些?