脑复苏时采取低温措施的主要目的是（）。 A.防止病人烦躁 B.降低脑细胞需氧量 C.

阅读理解。

    An old man lived alone in his old house. He hardly ever came out. He wouldn't communicate with others.

    One day, a little boy selling magazines knocked at the man's door. The door slowly opened. "Uh, sir, would

you like to buy a magazine?" The old man just stared (盯着) at the boy. The boy saw lots of dog sculptures

(雕塑品)on the table. "Do you collect dogs?" the boy asked. "Yes, they are all my family." Hearing this, the

boy understood and felt sorry for him." I have a magazine here about dogs. It's perfect for you." The old man

was ready to close the door and said, "No, I don't need any magazines."

    The boy suddenly had an idea. He had a dog sculpture, which did not mean much to him. After a while, the

boy returned with a box. The old man shouted this time,"I told you no magazines!" "I bring you a gift." The

boy opened the box and handed him the sculpture. The man got surprised because no one had given him a gift.

From that day on, the old man started coming out of his house. He and the boy became friends. The boy even

brought his pet dog to visit the old man every week.

根据短文内容，回答下列问题。

1. Did the old man live with his children?

2. What did the boy sell? 

3. Where were the old man' dog sculptures?

4. Why did the old man get surprised when he got the gift?

5. What do you think of the boy?

目前临床上最为简便和准确的血清Cl^-的测定方法为（）

A.火焰光度法

B.化学测定法

C.离子选择电极法

D.滴定法

E.电量分析法

（）应掌握“适时间苗，去弱留壮，间密留稀，合理定苗”的原则。

A.间苗

B.补苗

C.移植

D.定值

试述脑卒中患者的康复护理目标。

在计算机控制系统中，计算机输入输出信号都是（）信号。

A、模拟

B、脉冲

C、数字

D、开关量