血清病通常发生在一次大量注射抗生素（马血清）后几周（）
A.0～1周
B.1～2周
C.2～3周
D.3～4周
E.4～5周
参考答案：B
There was no sign _______ they had died from diseases such as bird flu - the main worry in such cases. Among the theories was _______ a truck had collided（碰撞）with the crowd.
A．/; that
B．that; that
C．that; which
D．that; /
在窗体上画一个命令按钮，然后写出如下事件过程： Private Sub Command1 _ Click( ) S=1 Do S=(S + 1) ^(S + 2) Number=Number+1 Loop Until S＞=6 Print Number，S End Sub 程序运行后，输出的结果是()。
A． 2 3
B． 3 18
C． 1 8
D． 10 20
