男性，62岁，半年来吞咽困难，钡餐造影示食管中段黏膜破坏，诊断

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问题单项选择题

男性，62岁，半年来吞咽困难，钡餐造影示食管中段黏膜破坏，诊断是

A．食管中段癌

B．贲门失弛缓症

C．食管中段憩室

D．食管炎

E．食管平滑肌瘤

答案

参考答案：A

单项选择题

通讯控制是现场各种数据通过（）采集，通过高速总线传送到中央控制室集中监控和管理。

A、人工

B、PLC

C、摄像头

D、高速总线

填空题

用所给单词的适当形式填空。

1. When we got there, all the beautiful birds had (appear) in the forest.

2. You are very confident to make a____(speak) in front of the whole school.

3. Many children in Tibet can get a good____ (educate) now.

4. More and more schools will be (build) in our hometown next year.

5. Many countries are paying more attention to the____(pollute) around us.