以下不属于农业废弃物的是（）
A.桔杆枝杈类
B.皮、壳、核类
C.工艺性废料
D.杂芥
参考答案：D
--How much the pants?-- __ twenty dollars.
A．is; It's
B．are; They're
C．are; It's
D．is; They're
