A student will probably attend four or five courses during each ________.

He asked me ___________ Zhang Hua came to school or not. 

— What would you like to have, meat or fish?

— _____________________.

You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.

It's ___________ to point to or talk about strangers in public.

— ___________________

— Once or twice a week.

A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.

— Which city has _________population, Beijing, Guiyang or Nanchang?

— Beijing, of course.

_____she comes or not makes no difference.

根据声像图，此为胎儿哪一器官______。

胎儿肾脏横切面图，胎儿肾盂分离小于______属于正常范围。

胎儿头部超声声像图，所示切面为哪个脑室切面_______。

如图，为一胎儿中脑-小脑切面，胎儿应该属于早、中、晚孕哪一阶段______。

根据声像图，此为胎儿哪一器官______。