— How many beaks does a bird have?
— It has _______________.[ ]
A. one
B. two
C. three
答案:A
As we know, success often comes after ______ failure; so don’t be so upset about _______ failure of this matter.
A.a; a
B.不填; the
不填; the
C.a; the
D.不填; a
钻塔工作台高度一般应()立根长度。
A.高于
B.等于
C.低于