—Have they finished the work?
—Not _______.[ ]
A. just
B. yet
C. ever
D. already
答案:B
有如下程序: Private Sub Commandl_Click( ) a$="A WORKER IS HERE" x=Len(a$) For i=1,To x-1 b$=Mid$(a$,i,3) If b$="WOR" Then S=S+1 Next Print S End Sub 单击命令按钮,程序运行结果为()。
A.1
B.2
C.3
D.5
蝶式套利是两个跨期套利的互补平衡的组合,可以说是"套利的套利"。()