绿色包装材料是指()
A.木质包装
B.纸质包装
C.塑料包装
D.所有可回收再利用包装材料
参考答案:D
There is somebody waiting for you, _________ I think might be one of your classmates.
A.who
B.whom
C.which
D.whoever
人和动物从植物的种子中主要能吸取的营养有哪些?