在水利工程施工中，根据开挖的难易程度，将土壤分为（）级。
A.Ⅰ～Ⅲ
B.Ⅰ～Ⅳ
C.Ⅰ～Ⅴ
D.Ⅰ～Ⅵ
参考答案：B
The man we followed suddenly stopped and looked as if ______ whether he was going in the right direction.
A．seeing
B．having seen
C．to see
D．to have seen
下列哪一项不是骨碎补的功效是（）
A.补肾
B.活血
C.止血
D.止泻
E.续伤
