突然发生的呼吸困难可有下列哪些疾病（） A.支气管哮喘 B.癔病 C.肺气肿 D.胸

全血在保存过程中，发生了“保存损害”，丧失了一些有用成分，它们是（）

A.血小板、粒细胞、不稳定的凝血因子

B.红细胞、白细胞、血小板

C.白细胞、血小板、稳定的凝血因子

D.白细胞、血小板、纤维蛋白原

E.血小板、淋巴细胞、凝血因子Ⅶ

在做“绿叶在光下制造淀粉”的实验中，是用什么溶剂脱去叶绿素的[ ]

A．酒精

B．水

C．碘液

D．氢氧化钠溶液

阅读理解

     Andy rode slowly on his way to school, daydreaming about the fishing trip that his father had promised him.He was so busy dreaming about all the fish he would catch that he was unaware of everything else

around him.

     He rode along until a strange sound drew him to the present.He came to a stop and looked curiously

up to the heavens.What he saw shocked and terrified him.A huge swarm of bees filled the sky like a black cloud and the buzzing mass seemed to be heading angrily towards him.

     With no time to waste, Andy sped off in the opposite direction, riding furiously-but without knowing

how to escape the swarm.With a rapidly beating heart and his legs pumping furiously, he sped down the

rough road.As the bees came closer, his panic increased.Andy knew that he was sensitive to bee stings (蜇). The last sting had landed him in hospital-and that was only one bee sting! He had been forced to

stay in bed for two whole days.Suddenly, his father's words came to him, "When you are in a tight

situation, don't panic.Use your brain and think your way out of it."

     On a nearby hill, he could see smoke waving slowly skywards from the chimney of the Nelson family

home."Bees don't like smoke," he thought."They couldn't get into the house." Andy raced towards the

Nelson house, but the bees were gaining ground.Andy knew he could not reach the house in time.He

estimated that the bees would catch up with him soon.

     Suddenly, out of the corner of his eyes, he spotted a small dam used by Mr.Nelson to irrigate his

vegetable garden.Off his bike and into the cool water he dived, disappearing below the surface and away

from the savage insects.After holding his breath for as long as he could, Andy came up for air and noticed

the bees had gone.Dragging himself out of the dam, he struggled up the hilly slope and rang the doorbell.

Mrs.Nelson took him inside and rang his mother.

     "You'll really need that fishing break to help you recover," laughed his mother with relief."Thank

goodness you didn't panic! " But Andy did not hear her.He was dreaming once again of the fish he would

catch tomorrow.

1. Why did Andy fail to notice the swarm of bees earlier?

A. He was riding to school.

B. He was listening to a strange sound.

C. He was going fishing with his father.

D. He was lost in the thought of the fishing trip.

2. Which of the following is NOT mentioned about the swarm of bees in the passage?

A. They crowded like a black cloud.

B. They shocked and terrified Andy.

C. They tried to attack Andy in a mass.

D. They made Andy stay in hospital for two days.

3. The underlined word "irrigate" in Paragraph 5 means ________.

A. plant  

B. water  

C. protect    

D. work

4. How did Andy avoid the bees in the end?

A. He asked Mr.Nelson for help.

B. He hid himself under the water.

C. He rushed into the Nelson house.

D. He rode off in the opposite direction.

5. Which of the following can best describe Andy's escape from the bees?

A. No pains, no gains.

B. Once bitten, twice shy.

C. Where there is a will, there is a way.

D. In time of danger, one's mind works fast.

有预定目的，需要一定意志努力的注意称为（）。

A.无意后注意

B.有意后注意

C.无意注意

D.有意注意

系统设计是结构化开发方法中的重要阶段，下列选项中( )不是系统设计的任务。

A．确定系统功能

B．进行总体设计

C．确定软件结构

D．完成数据库设计