简述确定配送中心数量时应考虑的主要要素。

阅读下面的材料，按要求作文。（60分）

莫言获得了2012年诺贝尔文学奖．随后召开新闻发布会，谈自己获奖后的感受。其中一位记者问道：您现在获得这个奖对您以后的文学创作有什么影响？莫言回答：这应该是一种巨大的鞭策，我想尽快从这个热闹和喧嚣中解脱出来，该干什么干什么。

请对莫言的那句“该干什么干什么”谈谈自己的看法，写一篇不少于800字的文章。要求：明确立意，自定文体，自拟标题；不要套作，不得抄袭。

阅读理解。

     The average adult has about five litres of blood living inside of their body, flowing through their vessels

(血管), delivering essential elements, and removing harmful wastes. Without blood, the human body would

stop working.

     Blood is the fluid of life, transporting oxygen from the lungs to body tissue and carbon dioxide from body

tissue to the lungs. Blood is the fluid of growth, transporting nourishment from digestion and hormones from

glands (腺) throughout the body. Blood is the fluid of health, transporting disease fighting substances to the

tissue and waste to the kidneys (肾脏).

     Because it contains living cells, blood is alive. Red blood cells and white blood cells are responsible for

nourishing and cleansing the body. Since the cells are alive, they too need nourishment. Vitamins and Minerals

keep the blood healthy. The blood cells have a definite life cycle, just as all living organisms do.

     About 55 percent of blood is plasma (血浆), a straw-coloured clear liquid. The liquid plasma carries the

solid cells and the platelets (血小板), which help blood clot. Without blood platelets, you would bleed to death.

     When the human body loses a little bit of blood through a minor wound, the platelets cause the blood to

clot so that the bleeding stops. Because new blood is always being made inside of your bones, the body can

replace the lost blood. When the human body loses a lot of blood through a major wound, that blood has to

be replaced through a blood transfusion from other people.

     But everybody's blood is not the same. There are four different blood types. Plus, your blood has Rh

factors, which make it even more unique. Blood received through a transfusion must match your own.

Patients who are scheduled to have major surgery make autologous blood donations (donations of their own

blood) so that they have a perfect match.

1. The blood can do the following except ____.

A. deliver essential elements for the body

B. remove harmful wastes from the body

C. absorb oxygen from the air to body tissue

D. move carbon dioxide from body tissue to the lungs

2. Which of the following is the least related to blood's role?

A. Life.

B. Growth.

C. Health.

D. Waste.

3. What is the function of the liquid plasma?

A. It is a straw-coloured clear liquid.

B. It carries the solid cells and the platelets.

C. It gives the blood cells a definite life cycle.

D. It helps the blood clot so that the bleeding stops.

导游小鲁接待了一个特殊的旅游团，这个旅游团的成员是由残疾人组成的，小鲁在工作中应注意什么？

《论自然》的作者是下面哪一位？（）

A、巴金

B、泰戈尔

C、德谟克利特

D、高尔基

柴油机使用电子调速器必须配备24V直流电源，电压波动（）。

A.<10%

B.<1%

C.<100%

D.<50%