29. Finding information in today’s world is easy. The ________ is how you can tell if the information you get is useful or not. (2006年高考天津卷)

A. ability　　　　 　B. competition　　　 　C. challenge　　　　 D. knowledge

28. Nowadays people have to pass various tests for professional ________ so that they can be　　 qualified for a well-paying job.

　 A. admission　　　 　B. permission　　　 　C. certificates　　　 D. perseverance

27. These chemicals may be harmful to human bodies. Use them with ________.

A. chart　　　　　 B. caption　　　　　 C. caution　　　　 D. catalogue

26. According to the recent research, heavy coffee drinking and heart attack are not necessarily ________ and effect．(2002年高考上海卷)

A．reason　　 　　　B．case　　 　　　C．fact　　 　　　D．cause

25. These two animals outward appearances are very alike, but they belong to different _________.

　 A. cases　　　　　 B. categories　　　 C. captions　　　　 D. chemicals　

24. Most people now accept that global warming could result in an environmental _________.

A. catastrophe　　　 B. cancer　　　　 C. channel　　　　 D. catalogue

23. You mustn’t carry too much ________ on you to the crowded public places. You can use your bankcard for buying things.

A. cheque　　　　 B. charge　　　　 C. baggage 　　　　D. cash

22. The lawyer advised him to drop the 　　_____,since he stands little chance to win.

A. choir　　 　　　B. choice 　　　　C. case　 　　　　　　D. challenge　

21. The Geoge Inn was a busy coaching stop for food and accommodation for travelers leaving London, and for _________ taking goods into the city.

A. carriers　　　　 B. champions　　　 C. chiefs　　　　　 D. civilians

20. The pictures painted by Picasso are really abstract. I can’t understand them without _________.

A. camera　　　　 B. caption　　　　 C. cassette　　　　 D. certificate