若方程x+y=3，x-y=5和x+ky=2有公共解，则k的值是（ ） A．2 B．-

阅读理解。

     The Dragon Boat festival is known as dragon-boat racing (龙舟赛). Dragon-boat racing is the most

 popular activity during the festival, especially (尤其) in South China. A dragon boat looks like a dragon,

 and is painted in red, white, yellow or black. Usually, a dragon boat is 20 to 40 metres long, and needs 20

  people to row. Boatmen row the boat in cadence (节奏) with the drumbeats (鼓点), as the captain (船

 长) in the front of the boat waves a small flag to help coordinate (使动作协调) the rowing.

    Dragon-boat racing is quite a spectacle (奇观). Now it becomes a popular activity in South China.

 International (国际的) dragon-boat racing is held in Guangzhou and Hong Kong every year.

1. The Dragon Boat festival is on _____. 

    A. 1st day of January            

    B. 15th day of January

    C. 5th day of April              

    D. 5th day of May

2. What is the most popular activity during the Dragon Boat Festival?

    A. Dragon-Boat racing          

    B. trick or treat

    C. Pumpkin lantern            

    D. Eat rice dumplings

3. A Dragon boat is _____ to _____ metres long and needs _____ people to row. 

    A. 20；30；20    

    B. 20；40；20    

    C. 10；40；20      

    D. 2；40；10

4. If you want to watch international dragon-boat racing, you can go _____. 

    A. Guangxi and Guangzhou        

    B. Guangzhou and Fujian

    C. Guangzhou and Hong Kong      

    D. Hong Kong and Guan.

5. This passage is about _____. 

    A. the dragon Boat Festival    

    B. Dragon-boat racing

    C. how to row the boat        

    D. South China

男性，65岁。有慢性便秘多年，近半年来发现站立时阴囊部位出现肿块，呈梨形，平卧时可还纳，体检发现外环扩大，嘱病人咳嗽时指尖有冲击感，平卧回纳肿块后，手指压迫内环处，站立咳嗽，肿块不再出现，诊为腹外疝，拟行疝成形术。

此病人诊断为（）

A.腹股沟斜疝

B.腹股沟直疝

C.股疝

D.脐疝

E.切口疝

在边长是12米的正方形花坛四周放花盆，每隔3米放一盆，每边可放______盆，四周共要放______盆．

公共关系活动的主体是公众（）