Plants can also detect volatile compounds produced by other plants.A tree under attack 4.____________hungry insects，for instance，may give off volatile compounds that let 5.____________trees know about the attack.In response，the other trees may send off chemicals to keep the bugs away—or even chemicals 6.____________attract the bugs’ natural enemies.

　　Now scientists have created a quick way to understand what plants are saying：a chemical sensor (传感器) called 7.____________electronic nose.The “e-nose” can tell compounds that crop plants make when they’re attacked.Scientists say the e-nose could help quickly figure out 8.____________plants are being eaten by insects.But today the only way to detect such insects is to visually inspect individual plants.

　　【答案】　1.Instead　2.to　3.plant　4.by　5.other　6.that　7.an

　　8．Whether

　　Ⅴ.阅读理解

　　Schools that serve healthier foods，offer nutrition education and reward students for nutritious eating habits can make a major difference in preventing childhood obesity (肥胖)．Schools that used such a multifaceted (多层面的) nutrition program reduced the number of overweight children by 50 percent.

　　“The serious consequences of childhood obesity have pushed us to find solutions that reach greater numbers of children，” Gary Foster，director of Temple’s Center for Obesity Researh and Education，said in a prepared statement.“We focused on school，because children spend most of their lives there and eat at least one if not two meals there.”

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