睡眠呼吸暂停时，鼻和口腔气流及胸腹式呼吸同时停止，是哪一型()A．阻塞型 B．中枢型

阅读理解。

     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.

1. The passage is mainly about______

A. American hospitality.          

B. the life of Americans.

C. American stores.              

D. the business of Americans.

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

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.

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.

下列各项中，属于内幕信息的有( )。

A．公司股权结构的重大变化

B．公司分配股利或者增资的计划

C．公司营业用主要资产的抵押、出售或者报废一次超过该资产的20%

D．上市公司收购的有关方案

犯罪条件主要包括（）、（）和侵害对象等。

使用烤灯时如何调节温度、灯距？

（）是指收发信机同时工作，任何一方在发话的同时也能接收对方的话音。