利用水准盒调平后，即便微倾螺旋调到极限，水准管气泡仍不能居中，产生这种现象多数是由于顶针过短或过长所致。( )
参考答案：对
The traffic rules say drivers mustn’t drive if they are drunk, _______they will be punished.
A．or
B．but
C．and
D．so
—Can your brother go out tonight?
—______.[ ]
A. No, he can
B. Yes, he can't
C. Yes, he can
D. No, she can't
