目前东风4型机车大修时柴油机普遍使用()材料的活塞。
A、锻铝
B、铸铁
C、钢顶铝裙
D、钢顶铁裙
参考答案:D
—The wind is always blowing here.
—How I wish it ______ today
A.won't blow
B.didn't blow
C.doesn't blow
D.isn't blowing