---- Hello. ________ Tina speaking. Is t

肺癌（）。

A.X线胸片见单个薄壁空洞

B.X线胸片呈大片状阴影，内为单个空洞伴液平

C.X线胸片有偏心空洞，内壁凸凹不平

D.X线胸片上肺有小片状阴影伴空洞

E.X线胸片呈大片状阴影，呈肺叶或肺段分布

— __________________

— There is a bed and a closet.[ ]

A. What's it?

B. Where's it?

C. What's in the bedroom?

________, I think, and you will settle the problem.[ ]

A. So long as you keep up your spirits

B. If you make your effort

C. Making great efforts

D. A bit more effort

中国一所高校原有学生2000人，后与美国一所高校交换留学生，中国高校选出5%的学生派往美国，同时美国高校也选出20%的学生派往中国，现在两所高校的在校生人数相同，那么美国高校原有学生( )人。

A．3600
B．3000
C．2800
D．2500