固体酸酸性来源和酸中心的形成是怎样的？

阅读下面这首诗，完成小题。（7分）

秦中吟歌舞

（唐）白居易

秦中岁云暮，大雪满皇州。雪中退朝者，朱紫尽公侯。贵有风雪兴，富无饥寒忧。

所营唯第宅，所务在追游。朱轮车马客，红烛歌舞楼。欢酣促密坐，醉暖脱重裘。

秋宫为主人，廷尉居上头。日中为一乐，夜半不能休。岂知阌乡①狱，中有冻死囚。

〖注〗①阌（wén）乡：旧县名。白居易有《奏阌乡县禁囚状》，详述了无辜妇孺被关进阌乡狱并遭受迫害的惨状。

小题1:这首诗揭露了中唐尖锐的社会矛盾，表现出强烈的忧国忧民之情，与杜甫名句“            ，           ”一脉相承。（2分）

小题2:赏析这首诗对比艺术的特色。（5分）

阅读理解。

     Shopping in the United States changes a lot. About ninety years ago most people shopped in small stores

that were owned by one person or a family. Women went from the bakery to the butcher's to the grocer and

on to the fruit and vegetable seller in order to get their food for the week.

     Then about sixty years ago, supermarkets were born. In a supermarket, people could get all the different

kinds of food they needed without going to different stores.

     The next big change in shopping in the United States was the shopping mall. A shopping mall is a group of

stores under one roof. Because malls allowed people to shop without worrying about the weather, they soon

became very popular. The mall became a place for people to socialize in addition to shopping. If you walk

through a mall, you will see older people sitting, chatting and drinking coffee. Malls are places for teenagers to

hang out. Many teens will often just "go to the mall" and spend time with their friends.

     The recent change in American shopping was the superstore. Large chain stores such as Wal-Mart, Office

Depot and Toys "R" Us have been built all across the United States. Because they are so large, they can buy

goods at a great discount and sell them much cheaper than smaller stores.

     Sometimes, when they are built near small towns, many of the small town stores have to close. They just

cannot compete with their giant neighbors.

     And now, online shopping is becoming more and more popular all over the States. People are too busy to

go to the physical stores, so they go shopping over the Internet. Online shopping has lots of advantages. For

instance, online stores are usually available 24 hours a day. Searching or browsing online shops can be faster

than browsing the physical stores. While, online shopping also has its disadvantages. People are at higher risk

of being cheated on the part of the merchant than in a physical store. And privacy of personal information

may be let out.

1. Which of the following shows the right order of shopping development in the United States?

    ①small stores ②superstores ③shopping malls ④shopping online ⑤supermarkets

A. ①②③④⑤

B. ①⑤②③④

C. ①⑤③②④

D. ②③④①⑤

2. Which is the place for people to spend time with others according to the passage?

A. Shopping malls.

B. Small stores.

C. Supermarkets.

D. Superstores.

3. Why can the superstores sell products at much lower prices?

A. Because they are built near small towns.

B. Because they are across the United States.

C. Because they sell all kinds of products people need.

D. Because they can buy goods at a reduction in the prices.

4. What's the disadvantage of online shopping according to the passage?

A. Wasting time.

B. Leaking personal information.

C. Fixed prices.

D. No chance to do physical activities.

油包水乳化钻井液的油相体积分数一般不超过（）。

A、55%

B、60%

C、65%

D、70%

岗位等级制的特点是什么？

患者无月经，无临床症状，子宫极小，长径<2cm，无子宫内膜回声，诊断为（）

A.幼稚子宫

B.单角子宫

C.先天性无子宫

D.始基子宫

E.正常子宫