Where is the cat? ___________ the tree.[ ]
A. Under
B. Like
C. This
D. It
答案：A
We must keep on learning if we want to keep up with the of the changing times.
A．schedule
B．journey
C．pace
D．transport
男，28岁，夜间突感胸闷，呼吸困难，X线检查如图，最可能的诊断是()
A．右侧气胸
B．右侧肺大泡
C．右侧肺部肿块
D．右侧肺气肿
E．右侧肺不张
