炭疽的预后以下哪型最差（）
A.皮肤炭疽
B.肺炭疽
C.肠炭疽
D.口咽部炭疽
E.炭疽脑膜炎
参考答案：B
—_____ the population of the U.S.A. in 2005?
—It _____ about 296 million.[ ]
A. What is; is
B. What was; was
C. How many is; was
D. How many was; is
关于膈的叙述，错误的是（）
A.左膈比右膈高
B.肺气肿膈下降
C.一侧肺不张膈升高
D.纵隔肿瘤会出现膈麻痹
E.大量胸腔积液膈影像难定
