21．C　 词义猜测题。从词语的上下文来看，address在此处的意思是“从事于”，即解决一个问题。由三四段得出。

20．B　 判断归纳题。仔细观察你所关心的东西能够导致科学研究。由第二段“the bike projects showed that some of the most interesting scientific research often…..”得出答案。

19．C　 细节理解题。改进自行车也可以成为科学项目。由第一段“In fact, the two-wheeled machines make for….”得出答案。

23. It can be inferred that Renato’s special bicycle is mainly designed for ________.

　　　 A. distant areas in the rainforest without electricity.

　　　 B. the use of his own family to make life easier.

　　　 C. the competition of ISEF to win money to support remote rainforests

　　　 D. enough exercise by pedaling it

[解题导语]本文介绍了一种特殊自行车以及它的多种便利。

[答案与简析]

22. Renato’s special Multibike has all the following EXCEPT　 ________.

　　　 A. making knives sharp　　　　　　　　　　　　　　　　　　 B. mixing any kind of drinks

　　　 C. producing electricity　　　　　　　　　　　　　　　　　　 D. operating a machine with its own electricity

21. The underlined word “address” in the third paragraph probably has the same meaning as _______.

　　　 A. make address written　　　　 B. give up 　　　　　　 C. work at　　　　　　 D. speak at

20. Which of the following is true according to the passage?

　　　 A. ISEF is an exhibiton displaying bicycle experiments designed by students.

　　　 B. Looking closely at things you are concerned about can lead to scientific research.

　　　 C. Renato’s improvement of the bicycle has solved the country’s great problem.

　　　 D. Renato’s special bicycle will soon be put into use in remote areas.’

19. What can we learn from the first paragraph?

　　　 A. Bicycles are the best way to go about

　　　 B. Bikes should be made more comfortable to ride.

　　　 C. You can improve your bicycle for science research.

　　　 D. Many inventions are connected with the bicycle.

18. C。　 标题概括题。本文主要是介绍了家长固定给孩子零用钱，从而让孩子学会如何节约，如何利用这些钱；同时，让孩子懂得钱的来之不易，从而学会理财。选项C正揭示了文章的主题。故答案选C。

　E

　　　 Bicycles are a great way to get around. They’re fun to ride, especially down hills. And, as you speed along the road, you might also think of ways in which you could improve your bike— make it safer, more efficient, or more comfortable. In fact, the two-wheeled machines make for some cool science projects.

This year's Intel International Science and Engineering Fair (ISEF), held last May in Cleveland, featured(had)three bicycle projects from three countries. Like many of the other experiments presented at ISEF, the bike projects showed that some of the most interesting scientific research often begins by taking a closer look at things you care about.

　　　 Renato Angulo Chu had even grander ambitions. The 12th-grader from Lima, Peru, wanted to address some of his country's economic troubles. 　

"I see a problem in my country," Renato said. "If you go to the forests in Peru, in some places you cannot find electricity. If you go with my bicycle, you can turn on the lights."

Renato, 16, spent 3 years designing his special Multibike. The device looks like a fixed exercise bike. It has wires fixed along the frame and a blender strapped(fastened) to the back. Turning the pedals operates the blender. The same principle can be used to sharpen knives or sweep city streets.

　　　 The Multibike can work either as a fixed bike or as a bicycle able to travel city streets and country roads. It's made from inexpensive materials, and the user gets exercise while pedaling to operate a machine.

"You pedal the bike, and you can mix any drink you want," Renato said. More importantly, he added, the same concept could be used to bring light to houses in remote regions of the rainforest.

17. A。　 词义猜测题。根据文章最后一段作者对于compound interest的解释以及所举的例子可知，“compound interest”是指存钱到期没有取出，并且一块把利息又放进去，从而实现“利息生利息”。故答案选A。