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1、Unit 2 Working the land.阅读理解ARecordings of angry bees are enough to send big, tough African elephants running away, a new study says.Beehives(蜂窝)either recorded or realmay even prevent elephants from damaging farmers crops.In 2002, scientist Lucy King and her team found that elephants avoid certain
2、trees with bees living in them. Today, Lucy wants to see if African honeybees might discourage elephants from eating crops. But before she asked farmers to go to the trouble of setting up beehives on their farms, she needed to find out if the bees would scare elephants away.Lucy found a wild beehive
3、 inside a tree in northern Kenya and set up a recorder. Then she threw a stone into the beehive, which burst into life. Lucy and her assistant hid in their car until the angry bees had calmed down. Next, Lucy searched out elephant families in Samburu National Reserve in northern Kenya and put a spea
4、ker in a tree close to each family.From a distance, Lucy switched on the prerecorded sound of angry bees while at the same time recording the elephants with a video camera. Half the elephant groups left the area within ten seconds. Out of a total of 17 groups, only one group ignored the sound of the
5、 angry bees. Lucy reported that all the young elephants immediately ran to their mothers to hide under them. When Lucy played the sound of a waterfall (瀑布) instead of the angry bees to many of the same elephant families，the animals were undisturbed. Even after four minutes，most of the groups stayed
6、in one place.Lucy is now studying whether the elephants will continue to avoid the sound of angry bees after hearing it several times. She hasnt tested enough groups yet to know, but her initial (最初的) results were promising enough to begin trials with farmers. She has now begun placing speakers in t
7、he fields to see if elephants are frightened away.1We know from the passage that elephants may be frightened of _.Aloud noises Bsome cropsCvideo cameras Dangry bees2Why did Lucy throw a stone into a wild beehive?ATo record the sound of bees.BTo make a video of elephants.CTo see if elephants would ru
8、n away.DTo find out more about the behavior of bees.3As mentioned in the passage, Lucy _.Aworks by herself in AfricaBneeds to test more elephant groupsChas stopped elephants eating cropsDhas got farmers to set up beehives on their farms4Which of the following is TRUE according to the passage?AYoung
9、elephants ignore African honeybees.BWaterfalls can make elephants stay in one place.CElephants do not go near trees with bees living in them.DFarmers do not allow Lucy to conduct tests in their fields.【语篇导读】本文介绍了一项有趣的科学实验，科学家通过大量实验来验证小蜜蜂能否有效阻止庞然大物非洲大象损坏农作物。1解析：选D。细节理解题。根据第三、四段Lucy所做的实验可知大象可能会被生气的蜜蜂吓
10、跑。2解析：选A。细节理解题。根据第三段可知Lucy在一棵树上找到了一个蜂窝，并且安装了一个录音机，她扔石头的目的是想惹蜜蜂生气，然后发出声音，从而录制其声音；第四段开头也提到了她录制好的声音。故选A。3解析：选B。推理判断题。根据最后一段可知Lucy现在正在研究是否大象在几次听到生气的蜜蜂发出的声音后还会被继续吓跑，她还没有将这一现象在足够多的大象群体中检验，由此可以推断她还需做足够多的实验。4解析：选C。细节理解题。根据第二段第一句可知，2002年Lucy和她的队员就发现大象会避开住着蜜蜂的树。故C项表述是正确的。BOrganic farming is a bigpicture exerc
11、ise. Its not only targeted at this seasons results, but considers future generations. In the long run it makes better economic sense as well. But its main goal is to contribute to a healthier world.Studies conducted all over the world have shown the effects that conventional chemical farming has on
12、the environment. Certainly, chemical fertilizers, pesticides, and herbicides increase the quantity of a farms production. They help produce more grains and vegetables. But at what cost？A Swiss study showed that organic farming produces an average of 20% less than conventional methods. But the organi
13、cally grown food contained 50% less fertilizer and 97 % less pesticides.Though only a part of the amount of pesticides a farm uses actually does the job of killing bugs, all of it remains active in the soil for months or even years after application.Perhaps worse, each generation of pests is growing
14、 increasingly immune (免疫的)to the chemicals used. Its not even all about the food and the soil. The pesticides used in conventional agriculture are finally spilling their chemical residues (化学残留) into the waterways. It affects wildlife, soil and ecosystems as a whole. According to a Worldwatch paper，
15、Deep Trouble: The Hidden Threat of Groundwater Pollution, poisonous chemicals are polluting groundwater on every inhabited continent, endangering the worlds most valuable supplies of freshwater.Perhaps not so intuitive, organic farming affects the air.“Organic agriculture can reduce greenhouse gas e
16、missions by effectively locking more carbon into the soil rather than releasing it into the atmosphere，” found “Farming Systems Trial，” a 15year study. Organic agriculture even uses 50% less energy than conventional farming.How does organic farming deal with pests? Organic farmers intentionally build up populations of beneficial insects, such as ladybu
