28. What is the first paragraph mainly about?

　　A. The basic data of the Transition.

　　B. The advantages of flying cars.

　　C. The potential market for flying cars.

　　C. The designers of the Transition.

　　29. Why is the Transition unlikely to show up in too many driveways?

　　A. It causers traffic jams.

　　B. It is difficult to operate.

　　C. It is very expensive.

　　D. It bums too much fuel.

　　30. What is the govemment’s attitude to the development of the flying car?

　　A. Cautious

　　B. Favorable.

　　C. Ambiguous.

　　D. Disapproving.

　　31. What is the best title for the text?

　　A. Flying Car at Auto Show

　　B. The Transition’s Fist Flight

　　C.Pilots’Dream Coming True

　　D. Flying Car Closer to Reality

　　D

　　When a leafy plant is under attack ，it doesn’t

　　sit quietly. Back in 1983,two scientists,Jack Schultz and Ian Baldwin,reported that young maple trees getting bitten by insects send out a particular smell that neighboring plants can get. These chemicals come from the injured parts of the plant

　　and seem to be an alarm.What the plants pump through the air is a mixture of chemicals known as volatile organic compounds,VOCs for short.

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