男性，66岁。两个月来吞咽粗硬食物时有哽噎感，胸骨后烧灼样、针刺样痛，吞咽水后缓解消失。
为明确诊断，进一步检查应首选
A. 胸部X线平片
B. 食管拉网脱落细胞检查
C. 食管吞稀钡X线双重对比造影
D. 超声内镜检查
查看答案
此时应采取的措施是（）
A. 麻醉下行内倒转术
B. 断头术或碎胎术
C. 外倒转术
D. 剖宫产术
E. 肢体还纳术
What can we infer from the last paragraph？
A. Computer scientists are quit optimistic about the existing anti-virus programs.
B. Computer scientists are looking forward to the coming anti-virus programs.
Computer scientists consider the existing viruses not the really destructive ones.
D. Computer scientists regard the coming viruses as the really destructive ones.
【B2】
A. informed
B. paid
C. noted
D. surprised
The figures in the first paragraph are cited to show that now
A. college graduates are surplus.
B. college diplomas are necessary to go upward in the society.
C. college diplomas are requisite credentials for getting good jobs.
D. more and more young people in the U.S. go to college.
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