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
---I'm afraid you have the wrong number.
---Sorry! _______.
A.It's only a coincidence
B.I have put my foot in my mouth
C.I was stuck.
D.I hope I didn't bother you
胎动减少是指胎动12小时少于()。
A.5次
B.10次
C.15次
D.20次
E.25次