问题 选择题

如图所示,A、B分别表示某一个门电路两个输入端的信号,Z表示该门电路输出端的信号,则根据它们的波形可以判断该门电路是(    )

A.“与”门     B.“或”门   

C.“非”门     D.“与非”门

答案

答案:A

题目分析:将A、B、C、D四个门电路注意代入,与门输入端全为“1”,输出端才为“1”,或门输入端只要有“1”,输出端就为“1”.发现A正确,B、C、D错误.

故选A

点评:解决本题的关键掌握门电路的特点,与门的特点:事件的所有条件满足,事件才能发生.或门的特点:只要有一个条件满足,事件就能发生.非门的特点:输入状态和输出状态完全相反.

阅读理解

阅读短文,选择正确答案。

     Hi, dear boys and girls! Do you know how to be a healthy kid? Here are some rules you should follow.

  First, eat different foods, especially fruit and vegetables. You may have a favourite food, but you'd better eat

something different, if you eat different foods, you will probably get more nutrients (营养物质) your body

needs.   

     Second, drink water and milk as often as possible. When you're really thirsty, cold water is the No.l choice

(选择). Milk is a great drink that can give you more calcium (钙) your body needs to grow strong bones (骨头).   

     Third, listen to your body. How do you feel when you are full? When you are eating, notice how your body

feels and when your stomach (胃) feels comfortably full. Eating too much will not make you feel comfortable

and make you fat.   

     Fourth, limit (限制) screen time. Screen time is the time you watch TV, DVDs and videos, or using

computers. It is good to take more exercise such as basketball, bike riding and swimming. You can't watch TV

for more than two hours a day.   

     Fifth, be active. One thing you'd like to do as a kid is to find out which activity you like best. Find ways to

be active every day.   

     Follow these rules and you can be a healthy kid.

1. You should eat different foods especially               [ ]

A. meat   

B. hamburgers  

C. sweets     

D. fruit and vegetables 

2. Which kind of drinks can give you more calcium? [ ]

A. Juice  

B. Milk     

C. Cold water  

D. Tea

3. According to the passage, you should follow              rules if you want to be healthy. [ ]

A. five  

B. nine     

C. fifteen    

D. thirteen

4. According to the passage, which of the following is TRUE? [ ]

A. When you're eating, you don't have to notice how your body feels.   

B. You can eat your favourite food as much as possible.   

C. You can watch TV whenever you like to get more information.   

D. We should try to live in an active way in our life.

5. Which is the best title for the passage? [ ]

A. How to make yourself important   

B. How to be a healthy kid   

C. How to be a popular kid   

D. How to make your parents healthy

阅读理解

阅读理解

     One of Vancouver's nicknames is Hollywood North. This name comes from the fact that Vancouver

is the third most filmed city in North America behind Los Angeles and New York City.

     Vancouver became known as a filming destination because it is a perfect stand-in(替身) for other

cities. Shot from the right angles, the downtown core could look like New York, Seattle, Boston or a

variety of other places. Also, the architectural smorgasbord(大杂烩) that is Vancouver, the low

Canadian dollar, and generous tax subsidies(税收补贴) attracted film production companies to the city.

     Many would accuse Vancouver of simply being a stand-in city, and not really being of any

significance to the overall culture of film production. However, this has proven not to be the case. The

creative establishment in the film sector has realized that Vancouver is more than just a stand-in; it is a

city that is filled with talent.

     Earlier this year Pixar Studios opened an animation studio in Vancouver. The animators made famous

by such hits as Toy Story, Monsters Inc, and Wall-E, demonstrated that Vancouver is now a major player in the film industry by opening up shops in the city.

     Amir Nasrabadi, the General Manager for Pixar Canada said the company decided to open an office in the city because of the "very mature(成熟的), high-quality talent pool, driven primary by the strength of

the industry and great local universities and schools"

     For now the studio will work as a satellite branch of Pixar's California studios, but future plans

include the Vancouver studio taking on its own feature films. The British Columbia Film Commissioner, 

Susan Croome, told CTV News in an interview that "Pixar's announcement is absolutely fantastic". When

asked if this expansion of Vancouver's film industry was the result of favorable exchange rates, she

responded that it wasn't, and the company was making plans for the long term.

1. Vancouver has the nickname of Hollywood North because _______.

A. the number of films it makes is second to Hollywood

B. it is one of the most filmed cities in North America

C. it looks much like Hollywood

D. it lies in north of Hollywood

2. What is a factor that makes Vancouver an attractive city for film production?

A. Lower expenses          

B. Historical places

C. Pixar Studios opening an animation studio

D. Right angles suitable for shooting films

4. In Susan Croome's opinion, _______

A. Pixar's announcement is hard to understand

B. good exchange rates can attract famous companies

C. Pixar Studios should open more offices in Vancouver

D. Pixar's decision is based on long term considerations

5. It is suggested in the passage that Vancouver _______.

A. is more than a stand-in city for making films

B. is best known for its animation films

C. has become a major film producer

D. is a poor but talented city