2．B　细节理解题。根据第三段中“Some plants，such as the oak tree，have thick and hard leaves that are difficult for animals to eat.”可知。故B项正确。

　　3．C　细节理解题。根据第四段中“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.”可知树根分泌出更多的nicotine。故C项正确。

　　4．B　主旨大意题。本文主要讲述的是不能移动的植物是如何保护自己的。故B项正确。

　　社会生活类

　　The Diet Zone:A Dangerous Place

　　Diet Coke,diet Pepsi,diet pills,no-fat diet,vegetable diet. . . We are surrounded by the word “diet” everywhere we look and listen. We have so easily been attracted by the promise and potential of diet products that we have stopped thinking about what diet products are doing to us. We are paying for products that harm us psychologically and physically(身体上).

　　Diet products significantly weaken us psychologically. On one level,we are not allowing our brains to admit that our weight problems lie not in actually losing the weight,but in controlling the consumption of fatty,high-calorie,unhealthy foods. Diet products allow us to jump over the thinking stage and go straight for the scale(秤)instead. All we have to do is to swallow or recognize the word “diet” in food labels.

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