需求预测的方法主要针对的是需求变化的规律，及偶然性的随机变化。

阅读理解。

     Mr. Hunt came from a poor family. He had three brothers and two sisters. His father worked hard but

wasn't paid much. And his mother did all the housework at home. They were both able but they couldn't get

enough money for their family.

     Mr. Hunt was in school for only three years and he had to stop to help his parents though he was good

at his lessons. When he was sixteen, he came to the city and began to work in a small factory. He learned

from an old worker and became a skilled worker. The old worker liked him and married his daughter to him.

The young man did not have his own house and had to live with his parents-in-law. His mother-in-law always

thought he was poor and often chattered. So the young man tried to save everything and hoped to have his

own house.

      It was one fine Sunday. The old woman wanted to have a picnic on the top of the hill. She told Mr.

Hunt to drive her car. But sometimes she told him to turn left and sometimes to turn right. The young man

had to listen to her. At a crossing the lights were red but she made him turn left. The policeman stopped them

and told the young man to give his license to him.

     "If I did wrong, sir," said Mr. Hunt, "It was my mother-in-law's fault (过错). She was driving the car

though she sat behind me!"

1. The Hunts were poor because ____.

A. they were lazy

B. they were too weak to work

C. they couldn't make enough money

D. they weren't able enough

2. Mr. Hunt left the school because ____.

A. he didn't like studying

B. his family was poor

C. he wasn't clever

D. he hoped to stay at home

3. ____, so the old man married his daughter to him.

A. Mr. Hunt became a skilled worker

B. Mr. Hunt was friendly to him

C. Mr. Hunt was paid much in the factory

D. Mr. Hunt worked for six years there

4. The old woman was ____ to Mr. Hunt.

A. good

B. bad

C. friendly

D. useless

5. Which of the following is wrong?

A. The old woman herself drove the car that day.

B. It was the old woman's fault.

C. Mr. Hunt hated his mother-in-law.

D. The old woman told Mr. Hunt to run the red lights.

患者男性，55岁，近2年出现头昏、乏力、面色苍白，伴上腹隐痛；无发热，小便正常，大便潜血(+)。血红蛋白70g/L，红细胞3.0×10/L，白细胞6.5×10/L，血小板200×10/L，网织红细胞0.008；尿常规蛋白(+)，管型(﹣)，白细胞1～3个/HP;血尿素氮5.2mmol/L。

首选下列哪些检查利于明确诊断：（）

A.骨髓象

B.心电图

C.游离血红蛋白

D.血清铁蛋白

E.血清结合珠蛋白

F.CEA

G.肛门指诊

H.血肌酐

I.胃镜+肠镜

J.游离原卟啉

Gibb′s反应的现象为（）

A.红色

B.绿色

C.蓝色

D.黑色

E.橘红色

竹茹的加工方法是（）

A.碾捣

B.制绒

C.青黛拌衣

D.揉搓

E.朱砂拌衣

按列车运行图分类，我国半自动闭塞区段多采用（）运行图。

A.平行

B.追踪

C.成对非平行连发

D.不成对