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2017年全国卷2DWhen 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. Th
2019年全国2卷CMarian Bechtel sits at West Palm Beach’s Bar Louie counter by herself,quietly reading her e-book as she waits for her salad. What is she reading?None of your business! Lunch is Bechtel’s “me” time. And like more Americans,she’s not a
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