采用填埋法处理的垃圾，不得含用（）
A.有机物
B.有毒物质
C.微生物
D.塑料制品
E.无机垃圾
参考答案：B
—Where are your brothers ?
—______.[ ]
A.He is at home
B. He is in his room
C. Yes, they are
D. I don't know
玉米适期早播为什么能增产？
