简述领导威信的作用。

第二部分 阅读理解（共两节20小题，每小题2分，满分40分）
阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
Suppose you want to buy some new clothes or a new TV. Or maybe you need some work done on your car. How can you find the best price without shopping all over town？Ads can help you. Ads can show you lots of prices. And you don’t have to go anywhere to see them. Just open a newspaper or magazine, and you’ll find plenty of ads. The following is an ad about TV sets for sale.
 
(   )41. How many different kinds of TV sets does the store advertise here？
A. Six.        B. Five. C. Four.       D. Three.
(   )42. Which of the following statements is TRUE according to the ad？
A. The lowest price is a little more than $300.
B. You can buy any kind of TV set on July 14th.
C. The larger the screen is, the higher the price will be.
D. The service time is 9 a.m. to 9 p.m. every day except Monday.
(   )43. Which is NOT mentioned in the ad？
A. The name of the store.                    
B. The address of the store.
C. The deadline (最后期限) for TV sales.       
D. The postcode (邮编) of the place where the store is.
(   )44. What can ads do for us according to the passage?
A. They can help us cut down the prices before shopping.
B. They can show us plenty of prices after shopping all over town.
C. They can help us learn about the quality of the advertised things.
D. They can help us find the best price without shopping everywhere.