材料交付不可以采用（）方式。
A.送货
B.自提
C.代运
D.委托提取
参考答案：D
—______ do you like P.E?
—Because it’s fun.[ ]
A. Where
B. When
C. Why
From the dates on the gold coin, we know that it was made 500 years ago. [ ]
A. marking
B. marked
C. to mark
D. to be marked
