题目内容
This year, my husband Doug and I celebrated the 25th birthday of a man we had never met. His name was Tonny Horn. On the night of October 21, 2005, when he was standing in a parking lot (停车场) talking to friends, Tonny jumped to the top of a car, as he had done a hundred times before. This time, though, Tonny lost his balance (平衡). His head struck the ground, hard. All night, Elizabeth, Tonny’s mother, stood next to her son, who was lying in a hospital bed. She remembered that Tonny has once mentioned organ (器官) donation (捐献). Maybe I can spare another family this pain, she thought. When the time came, she and her husband Tom signed the forms permitting his organs to be taken out. Tonny was declared dead the next day. Twenty-four hours later, in a Boston hospital, Tonny’s liver (肝脏) was made part of my husband, Doug, who was suffering from a hopeless liver disease. Months later, we learned the Tonny’s parents wished to meet someone who had gained life through the gift from their son. A meeting was arranged by the organ bank to bring together the two families. The meeting was risky, but worth it. We learned for the first time how Tonny had lived and died. We learned something about Tom and Elizabeth too. For the Homes, seeing Doug and knowing he was well seemed to ease (减轻) their suffering. I’ll never forget seeing Doug’s tall figure stooped (弯腰) over Elizabeth, her arms around his waist, as a mother would hug (拥抱) a son. Tonny’s parents decided to donate Tonny’s organs because ______.
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Animals can move from place to place, but plants cannot. When an animal is attacked, it can run away or fight back. Plants, however, certainly cannot run away, and they lack teeth and claws (爪子). But plants can defend themselves by using both physical and chemical means (方法). Some plants have their own ways to keep animals away. For example, the leaves of the holly (冬青树) plant have sharp spines (刺) that discourage grass-eating animals. Holly leaves on lower branches have more spines than leaves on upper branches, which is because the lower leaves are easier for most animals to reach. Some plants, such as the oak tree (橡树), have thick and hard leaves that are difficult for animals to eat. Some grasses may contain a sandy material; eating such grasses wears down the animal’s teeth. Many plants also have chemical defenses. Some plants produce chemicals that taste bitter or cause an unpleasant reaction. Some plants may fight against an attack by increasing the production of these chemicals. When a caterpillar (毛虫) bites a tobacco leaf, the leaf produces a chemical messenger. This messenger sends to the roots the information to produce more nicotine (尼古丁). The higher levels of nicotine discourage the caterpillar. Many plants depend on both physical and chemical defenses. A certain plant in China, for instance, has prickly (多刺的) leaves, and each prickle contains poisonous venom (毒液). A single experience with this kind of plant will teach an animal to stay away from it in the future. In order to defend themselves, oak trees use ______.
Animals can move from place to place, but plants cannot. When an animal is attacked, it can run away or fight back. Plants, however, certainly cannot run away, and they lack teeth and claws (爪子). But plants can defend themselves by using both physical and chemical means (方法). Some plants have their own ways to keep animals away. For example, the leaves of the holly (冬青树) plant have sharp spines (刺) that discourage grass-eating animals. Holly leaves on lower branches have more spines than leaves on upper branches, which is because the lower leaves are easier for most animals to reach. Some plants, such as the oak tree (橡树), have thick and hard leaves that are difficult for animals to eat. Some grasses may contain a sandy material; eating such grasses wears down the animal’s teeth. Many plants also have chemical defenses. Some plants produce chemicals that taste bitter or cause an unpleasant reaction. Some plants may fight against an attack by increasing the production of these chemicals. When a caterpillar (毛虫) bites a tobacco leaf, the leaf produces a chemical messenger. This messenger sends to the roots the information to produce more nicotine (尼古丁). The higher levels of nicotine discourage the caterpillar. Many plants depend on both physical and chemical defenses. A certain plant in China, for instance, has prickly (多刺的) leaves, and each prickle contains poisonous venom (毒液). A single experience with this kind of plant will teach an animal to stay away from it in the future. Why does the holly plant have more spines on the lower leaves
Animals can move from place to place, but plants cannot. When an animal is attacked, it can run away or fight back. Plants, however, certainly cannot run away, and they lack teeth and claws (爪子). But plants can defend themselves by using both physical and chemical means (方法). Some plants have their own ways to keep animals away. For example, the leaves of the holly (冬青树) plant have sharp spines (刺) that discourage grass-eating animals. Holly leaves on lower branches have more spines than leaves on upper branches, which is because the lower leaves are easier for most animals to reach. Some plants, such as the oak tree (橡树), have thick and hard leaves that are difficult for animals to eat. Some grasses may contain a sandy material; eating such grasses wears down the animal’s teeth. Many plants also have chemical defenses. Some plants produce chemicals that taste bitter or cause an unpleasant reaction. Some plants may fight against an attack by increasing the production of these chemicals. When a caterpillar (毛虫) bites a tobacco leaf, the leaf produces a chemical messenger. This messenger sends to the roots the information to produce more nicotine (尼古丁). The higher levels of nicotine discourage the caterpillar. Many plants depend on both physical and chemical defenses. A certain plant in China, for instance, has prickly (多刺的) leaves, and each prickle contains poisonous venom (毒液). A single experience with this kind of plant will teach an animal to stay away from it in the future. How does tobacco protect itself against an attack from a caterpillar
某患者，女，45岁，身高160cm，体重75kg，临床诊断为2型糖尿病。实验室检查：空腹血糖8.7mmol/L，餐后2小时血糖13.1mmol/L，糖化血红蛋白7.1%。经饮食控制、规律锻炼，血糖控制仍未达到理想水平。 该患者的糖尿病治疗应首选的药物是
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