滑油供油压力不足会导致（）。
A．接合面漏油
B．滑油氧化变质
C．滑油消耗增加
D．机件磨损加剧
参考答案：D
设集合U={1，2，3，4，5}，A={1，2，3}，B={2，4}，则A∩（CUB）=[ ]
A.｛1，3｝
B.｛2，4｝
C.｛1，2，3，5｝
D.｛2，5｝
“We weren’t sure which way to go. In the end, we turned right.”
“You _______ the wrong way. You _________ left.”
A．had gone; must have turned
B．went; must turn
C．have gone; would have turned
D．went; should have turned
