State. It’s an amazing accomplishment and one we cannot achieve without generous support from individuals, corporations, and other social organizations. Visit pacificorganzier.org to find various ways you can support Pacific Science Center.

　　21.Where can you buy a souvenir at pacific Scicnce Center?

　　A. In Building 1.

　　B. In Building 3.

　　C. At the laser Dome

　　D. At the Denny Way entrance.

　　22.What does Pacific Scicnce Center do for schools?

　　A. Train Science teachers.

　　B. Distribute science books.

　　C. Inspire scienctific research.

　　D. Take science to the classroom.

　　23.What is the purpose of the last part of the text?

　　A. To encourage donations.

　　B. To advertise coming events.

　　C. To introduce special exhibits.

　　D. To tell about the Center’s history

　　B

　　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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