患者，男性，23岁，吞咽困难，时有呕吐，吐出陈旧性食物残渣，用药后症状无缓解，行食管

党和国家在新世纪要完成的三大历史任务是( )。①完善和发展社会主义市场经济②继续推进现代化建设③完成祖国统一④全国建设小康社会⑤维护世界和平与促进共同发展

A．①③④

B．②③⑤

C．①④⑤

D．①②③

句型转换

1. 昨天他不得不早起床赶公共汽车。    

He          get up early to catch the bus yesterday.  

2. 现在我必须做作业。

I          do my homework now.

3. I had to get up early yesterday.(改为否定句)

I               to get up early yesterday.  

4. She has to clean the room every day. (改为否定句)

She               to clean the room every day.  

5. I can dance and sing. (改为否定句)

I        dance        sing.  

6. The students can eat in the hallway.(改为一般疑问句)    

       the students        in the hallway？

— He didn't win the race at last, did he?

— _________, though he tried to run as fast as he could. [      ]

A. No, he didn't

B. Yes, he did

C. No, he did

D. Yes, he didn't

宪法制定权

人参的粉末显微特征是（）

A.方晶与油室

B.针晶与油细胞

C.簇晶与树脂道

D.柱晶与纤维

E.砂晶与石细胞