放在水平地面上的木箱，重100N，地面对它的支持力是____________N，

如图所示，在粗糙水平面上固定一点电荷Q，在M点无初速释放一带有恒定电量的小物块，小物块在Q的电场中运动到N点静止，则从M点运动到N点的过程中（　　）

A．小物块具有的电势能逐渐增大

B．M点的电势一定高于N点的电势

C．小物块所受电场力逐渐减小

D．小物块电势能变化量的大小一定等于克服摩擦力做的功

酒花第4水、第6水时亩分别追施尿素50～100千克、磷酸二铵5～10千克、硫磷钾10千克，并观察其长势长相，根外追施尿素和磷酸二氢钾。

In the United States you will find yourself being urged from every page of every newspaper and every television station to buy all kinds of goods.

Not only is there a wide range of prices for goods in America, there is also a wide range in the quality of goods offered for sale. Unlike some countries,

Americans generally pay the price of a product without question, instead of trying to get a lower price by bargaining. However, there are many “sales” in the United States, during which time stores will lower their normal prices. This may all be very confusing to visitors. How are you going to know how to “get your money’s worth” when you shop? Perhaps the best advice is: Don’t hurry. Visit various stores and determine the quality of goods. Read the advertisements so that you can compare prices.

There is a great variety of shops in the United States, ranging from very large stores called “department stores” to very small shops. There are “discount houses” offering goods at low prices, and “dime stores” specializing in a wide range of inexpensive items.

Most department stores in large cities carry better quality products at higher prices. However, they offer the shoppers great convenience since they contain such a wide variety of products.

If convenience isn’t as important to you as price, you may want to shop in discount houses. These stores have nearly as great a variety of goods as department stores, but offer lower prices. They can do so for several reasons. They don’t offer the same services to buyers that department stores do; there may be fewer sales people; and the store probably doesn’t deliver purchases.

Another popular shop is the “dime store”. No longer selling many things for five or ten cents, these stores got their name in the last century when it was decided that a small profit on a great quantity of goods would be better than a large profit on fewer sales. Dime stores specialize in a wide variety of inexpensive items and today, prices range from a quarter or 50 cents up to several dollars.

小题1:The passage is mainly about______

A．American hospitality.

B．the life of Americans.

C．American stores.

D．the business of Americans.小题2: Why can discount houses offer goods at lower prices compared with department stores?

a. They have fewer employees.

b. They have larger quantities of goods.

c. They offer fewer services.

d. They don’t provide delivery service.

A．a b c

B．a b d

C．a c d

D．b c d小题3:What’s special about dime stores?

A．They sell lots of goods at a small profit.

B．They make big profits by selling some goods.

C．They provide goods with a price lower than 50 cents.

D．They provide goods ranging from bargains to expensive ones.小题4:Where can we most probably read this passage?

A．In a research paper.

B．In a science report.

C．In a geography book.

D．In a travel magazine.

阅读理解。

     Every kid wishes to be an adult. But now as grown-ups, some adults find they cannot leave childhood

behind. They become "kidults" (kid+adult). Being a kidult has become a lifestyle-choice among young people

across Asia. Some kidults collect toys they once played with. Hello Kitty, Garfield, and Snoopy have many

adult fans around the world. It is not unusual to see a 20-something woman with a big, Garfield-shaped

cushion on her sofa or a Hello Kitty mobile phone accessory.

     Other kidults still enjoy children's stories and fairy tales. For example, Bloomsbury even published the

Harry Potter novels with an adult cover. That way, no one else on the subway will know that an adult is

actually reading a children's book!

     "Kidults can be like vitamins to society. Adults who value their childhood and hold on to pure, child-like

emotion may be needed in such a rough and dry society," said Lee Sojung, professor of Foreign Studies at

Hankuk University (韩国外国语大学). He added that kidult culture may fill the generation gap between adults

and kids. It could give children and their parents books, movies, and cartoon shows to enjoy together. He

may be right.

     Tim Greenhalgh, a professor, explained that some kidults just refuse to grow up. They value childhood

because life in a busy and stressful city frightens them. Kidults would like to forget their age and openly

show their fear of society and adulthood.

1. We can infer from the article that _____.

A. Kidults miss their childhood so much that they can't give up their toys

C. Kidults like to have vitamins very much

B. Bloomsbury knows some kidults don't want people to know that they are kidults

D. Some toys are so interesting that even adults like them very much

2. According to the author, being a kidult is good in some way except that _____.

A. it can improve the relationship between parents and their kids

B. it can help kidults feel relaxed

C. it is helpful to solve some social problems

D. it can make people loyal to one's parents 

3. According to the writer, _____.

A. being a kidult is nothing wrong

B. kidults have mental problems

C. our society is very dull

D. some people can never grow up

单税制是税收分类的一种。 ( )