开瓣音是由于A．心室舒张期负荷过重，心肌张力减低与顺应性减退，心室舒张时，血液充盈引

完形填空。

     Mike is a little boy. He    1   four years old. One day, his mother    2   him to see his grandmother.

His grandmother's home is very far    3   their house. So they go there   4  . There    5   only a few people

on the bus. They all sit on    6   seats. Mike is very happy. He looks    7   the window and talks with his

mother. After a while, Mike starts running on the bus. He runs and runs, "   8   are you always running?

Please sit   9   ," his mother says. "I want to see my grandmother   10   . I want the bus to move faster."

Mike answers.

B. makes        

B. off          

B. with a bus    

B. have          

B. their        

B. out          

B. How          

B. down          

B. later        

C. is        

C. lets      

C. to        

C. by bus    

C. are        

C. theirs    

C. from      

C. Why        

C. up        

C. earlier    

Form the sentences. 连词成句。

1. does,   Danny,   what,   to,   do,   like   

                                                                               ?

2. She,   to,   on,   computer,   likes,   play,   the  

                                                                                .

3. like,   I,   play,   to,   basketball,   my,   with,   father

                                                                                .

患者男性，64岁，反复鼻出血3个月，伴头痛耳鸣1个月余，患者行MR图像如下，最有可能的诊断是（）。

A.恶性淋巴瘤

B.颅咽管瘤

C.鼻咽癌

D.鼻咽纤维血管瘤

E.慢性鼻咽炎

将旅游规划与开发的效益分为可恢复和不可恢复两类的分类标准是（）。

A.按照效益产生的来源分类

B.按照效益产生的效果分类

C.按照效益产生的影响程度分类

D.按照效益产生的类别分类

管道运输有哪些主要特点？