可采取改善天然气燃烧方法或添加一些重质烃类来提高辐射传热效果。

阅读理解。

Dear Wu Qian,

      Thank you very much for your letter. You want to know about my favorite sport and instruments.

Now  I tell you. I  like  playing  basketball  very  much. And I like  volleyball  and ping-pong. Playing

basketball is my favorite instrument is piao. I play the piao every weekend. What about you? What's

your favorite sport? Do you like to play the piano? Who's your favorite player? Please write and tell me. 

                                                                                                                                           Yours,

                                                                                                                                           Han Mei

1. The letter is from ______.

A. Han Mei  

B. Wu Qian  

C. Lucy    

D. Bob

2. Han Mei's favorite sport is ______.

A. swimming  

B. playing basketball  

C. running    

D. playing volleyball

3. Han Mei is good at______.

A. dancing    

B. singing    

C. painting    

D. swimming

4. Han Mei wants to know ______.

A. how old Wu Qian is

B. What Wu Qian has  

C. what Wu Qian's favorite sport is

D. where Wu Qian has

5. The letter is to ______.

A. a teacher    

B. Mary    

C. Han Mei    

C. Wu Qian

诊断急性胃炎应选用

A．胃镜检查
B．钡餐造影
C．腹部CT
D．腹部B超
E．胃液分析

K5型转向架常接触式橡胶弹性旁承，由旁承体组成、调整垫板组成、（）等配件组成。

下列哪种疾病最易出现无痛性血尿（）

A.肾盂肿瘤

B.肾囊肿

C.肾结核

D.肾结石

E.泌尿系感染

下图是我国汉江与淮河流域界线附近部分地理事物分布示意图，完成下列小题。

流经灌溉区的河流总体是（）

A．流向东南

B．流向西南

C．流向东北

D．流向西北