电子商务概念模型是对现实世界中电子商务活动的一般抽象描述，它由______、 ___

该病例的诊断是

A．结膜炎

B．角膜上皮擦伤

C．急性胃肠炎

D．急性虹睫炎

E．急性青光眼

The Japanese have always loved fresh fish. But the waters close to Japan have not held many fish for decades. So fishing boats went farther than ever.but If the return trip took more than a few days, the fish were not fresh. The Japanese did not like the taste.

Then fishing companies equipped their boats with freezers. They would freeze them at sea. Freezers allowed the boats to go farther and stay longer. However, the Japanese could taste the difference between fresh and frozen and they did not like frozen fish. 

So fishing boats were equipped with fish tanks. They would  stuff  fish in the tanks（水槽）,fin（ 鱼翅）to fin .After a little thrashing(颠簸) around, the fish stopped moving. They were tired and dull, but alive. Unfortunately, the Japanese could still taste the difference. The Japanese preferred the lively taste of fresh fish, not sluggish fish.

To keep the fish tasting fresh, the Japanese fishing companies still put the fish in the tanks. But now they add a small shark to each tank. The shark eats a few fish, but most of the fish arrive in a very lively state. The fish are challenged.

Have you realized that some of us are also living in a tank but most of the time tired & dull, so we need a Shark in our life to keep us awake and moving.  If your challenges are the correct size, and if you are regularly defeating those challenges, you are Conqueror. You think of your challenges and get energized. You are excited to try new solutions. You are alive! Here is some advice for you :

1. Instead of avoiding challenges, jump into them and enjoy the game. If your challenges are   too large or too numerous, do not give up. Instead, reorganize. Find more determination, more knowledge, more help.

2. God didn't promise days without pain, laughter(笑) without sorrow, sun without rain, but he did promise strength for the day, comfort for the tears and light for the way.

3. Disappointments are like road blocks, they slow you down a bit but you enjoy the smooth road afterwards. Don't stay on the bumps too long. Move on!

小题1:Why did fishing companies equip their boats with freezers?

A．to keep the fish taste fresh

B．to increase the price of the fish

C．to avoid challenges in the market

D．to keep the fish alive小题2:Which of the following is right?

A．The Japanese don’t like sluggish fish, so the Japanese fishing companies won’t put the fish in the tanks

B．Since the waters close to Japan have not held many fish for decades, they have to go farther to catch fish.

C．Road blocks slow you down and stop you going on .

D．If your challenges are too large or too numerous, give it up first.小题3:The topic of the passage may be ___

A．avoid challenges

B．keep your life active

C．ways to keep fish fresh

D．some advice for you小题4:“we need a Shark in our life to keep us awake and moving”means ____

A．we need challenges of too large or too numerous to make us energized.

B．we have to accept being beaten by those challenges in life.

C．You are excited to try new solutions.

D．The society we live in is like the fish tank,we need some challenges to keep us energized.

慢性根尖周炎的瘘壁上皮可来自

A．牙板上皮
B．缩余釉上皮
C．Serres上皮剩余
D．Malassez上皮剩余
E．呼吸上皮

自然界是人类生命发展和延续所依存的环境。同时，作为人与自然物质交换过程的生产劳动，是人类社会关系和发展的起点；人们在加工自然的劳动中，才结成了人与人之间的关系——生产关系，并由此形成民族、阶级、家庭等复杂的社会关系。
由此可以推出( )。

A．人的社会关系具有其内在的发展规律，可以独立地存在和发展
B．人是自然界的一部分，因为人也是动物
C．人与人、人与社会的关系，是建立在人与自然的关系基础之上的
D．人在自然面前只有被动地适应，才能生存并发展

使用钻床不允许戴手套，使用冲床（）操作。

A.不戴手套

B.戴手套

C.戴专用保护手套

D.任意