程序设计语言一般可划分为低级语言和高级语言两大类，与高级语言相比，用低级语言开发的程序具有（）等特点。
A.开发效率低，运行效率低
B.开发效率高，运行效率低
C.开发效率低，运行效率高
D.开发效率高，运行效率高
参考答案：C
解析：本题考查低级语言与高级语言的概念和区别。低级语言指抽象层次低、较接近于计算机硬件而较远离问题域的程序设计语言，高级语言则反之。因此，一般来说，低级语言的运行效率较高，但需要程序员对底层知识有深入细致的理解，开发难度高、周期长。
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| It seems that the cities in the future will have to change. Because the world's population __1__ , there will be __2__ people in the cities tomorrow. It may be __3__ for any family to live in a house with land around it. There__4__ enough space for them. __5__ to solve this problem may be the skyscraper city (摩天城). The highest building in the world  today is in Taipei. It's about 509 metres high. The skyscraper cities in the future will be many times __6__ . In a skyscraper city about 250,000 people will live. Nearly a million people can __7__ in four of these great buildings. Each skyscraper city will have four towns in it and each town will have ten villages. They will live, work and __8__ their free time in them. They won't need to leave the city __9__ they want to. They will be able to move about in the city by transport controlled __10__ computers. Let's imagine how the life will be then! | |||
| ( ) 1. A. has grown ( ) 2. A. many ( ) 3. A. impossible ( ) 4 A. aren't ( ) 5. A. A way ( ) 6. A. lower ( ) 7. A. live ( ) 8. A. spend ( ) 9. A. until ( ) 10. A. by | B. is growing B. much B. possible B. won't be B. A road B. shorter B. study B. cost B. when B. at | C. are growing C. more C. important C. won't have C. An answer C. taller C. work C. pay C. while C. with | D. have grown D. larger D. necessary D. haven't D. An idea D. higher D. be D. take D. unless D. in |