哪些药材可防止冬虫夏草生虫（）
A.泽泻
B.藏红花
C.大蒜
D.细辛
E.生姜
参考答案：B
Many trees ________ along the streets every year. So the air is very fresh now.
A．plant
B．are planted
C．planted
D．were planted
焊条电孤焊的烟尘还来源于焊条药皮，如（）等产生的有害物质
A.塑料
B.大理石
C.锰铁
D.硅铁
