我国大、中型城市医院中发生尿瘘的最常见的原因是
A．盆腔放疗B．产伤C．妇科手术D．膀胱结核E．晚期癌
参考答案：C
At the science museum, the students from Sunshine Middle School got to know_______.
A．what does the spaceship look like
B．what the spaceship looks like
C．How the spaceship looks like
D．how does the spaceship look like
简述清塘的目的及主要方法？
