生态系统中的食物链可分为哪三种主要类型？

下列有关Crohn病的临床表现正确的是

A．病变只局限于结肠

B．回肠很少被累及

C．病变可呈节段性分布

D．主要症状是便血

为什么说权变是管理中唯一不变的管理手法？

患者心烦不寐，痰多胸闷，嗳气吞酸，恶心欲吐，饮食减少，口苦目眩，舌红苔黄腻，脉滑数。治疗应首选（）

A.丹栀逍遥散

B.温胆汤

C.黄连阿胶汤

D.归脾汤

E.安神定志丸

Every year, there is an important lottery（ * * ）in Newtown. The lottery raises money for the local hospital. Most people buy at least one ticket, because the first prize is a million dollars!

One year, John Smith won the first prize. He immediately gave up his job and started to enjoy himself. He bought the fastest and most expensive car he could find. He bought a motorboat. He traveled twice around the world, eating and drinking at the most expensive restaurants. He went on a safari in Africa. He explored the South Pole. He lived a life of pleasure, luxury and adventure. He put on a lot of weight from eating too much good food.

Two years later, after he had spent all his money, he returned home and asked for his job back. He had only been back at work a few days when one of the girls in the office tried to sell him a lottery ticket.

“You must buy one, John,” she said. “Remember how lucky you were last time?”

“I am not buying any more lottery tickets. ” He said.

“But you must,” the girl argued. “You might win again. ”

“That’s what frightens me,” John said. “If I try to do again all the things I did last year, I will be dead before the end of this year!”

61. Where did the lottery take place?    

A. In the local hospital.    B. In Newtown.   C. In Africa.  D. At the South Pole

62. What was the money raised by the lottery used for?   

A. To buy fast cars.             B. To allow people to travel

C. To help the local hospital.       D. To feed hungry people.

63. What did John Smith win?     

A. A lottery ticket.     B. A car      C. Money      D. A vacation

64. When John Smith won, what was the first thing he did? 

A. He ate a lot.                 B. He bought a motorboat.

C. He bought another ticket.       D. He stopped working.

65. How long did it take John Smith to spend his money?   

A. Two years     B. One year.     C. A few days    D. Until the end of the year.

下述关于C语言文件的操作的结论中，正确的是______。

A．对文件操作必须先关闭文件

B．对文件操作必须先打开文件

C．对文件操作顺序无要求

D．对文件操作前必须先测文件是否存在，然后再打开文件