我国著名的三大瀑布是指（）。
A.诺日朗瀑布
B.黄果树瀑布
C.壶口瀑布
D.吊水楼瀑布
参考答案：B, C, D
He never told us why he was late, _____? [ ]
A. wasn't he
B. didn't he
C. did he
D. have he
B线中涂喷漆室缩采用的捕雾方式为（）。
A.文丘里
B.水旋式
C.水帘
