UNIT 5 WORKING THE LANReading for WritingChemical Versus Organic FarmingChemical pesticides(_) and artificial fertilizers(_) _(be) _(广泛使用) in farming since the middle of the 20th century. When they first _(introduce), many farmers welcomed them _ a great way_(fight) crop disease and _(增加产量). Over time, however, _ _(科学家们发现的是) their _(长期使用) can sometimes harm _ the land and peoples health._, pesticides can damage the land _ killing not only harmful bacteria and insects, but also helpful _(one). _, these chemicals can stay in the soil and underground water sources(_) for a long time. This affects the crops _(grow) on the land and, _(转而，反过来), the animals and humans _ digest them. Many people worry that these chemicals may (使他们生病) and even _(引发癌症). In fact, some pesticides like DDT _(prohibit) in _(many) countries because of _(他们引起的伤害) people and the environment. _ chemical fertilisers, crops _(grow) with them usually grow too fast _(be) rich in nutrition. They may look beautiful on the outside, _ inside there is usually more water than_(必须的) minerals, and they often have _(little) flavour as well._(作为一个替代选择), some farmers _(转向) organic farming, and many customers have turned to _(有机食品)_ they _(购物) at the local grocery(_). Organic farming is _(simple) farming _ using any chemicals. Organic farmers _(聚焦于) keeping their soil rich _ free of disease_(通过自然的方式). For example, many organic farmers use _ (天然的粪便) from animals as fertiliser. This makes the soil in their fields _(rich) in minerals. _ also keeps the air, soil, water, and crops _(免于) chemicals.Organic farmers also use many _ methods to produce(produce) rich soil. They often change the kind of crop _(grow) in each field every year. _, they may grow corn or wheat in a field one year, _ then grow beans there the next. _(为什么不同的庄稼被种植是因为) they put important minerals back into the ground, _(make) it ready again for the next batch of(_)crops. Organic farmers also plant _(各种各样的) crops that used different _(深度) of soil to help keep it rich. For example, peanuts grow on _ grounds surface, but many other vegetables put down deep roots. The goal of using different organic farming methods is _(grow) good food while _(avoid) damage to the environment _to peoples health.Some people would _(更愿意) stop the use of man-made chemicals in agriculture _(extire). _(阻止他们这样做的是) the fact_ chemical farming_(满足的高需求) food around the world. Organic farming is _(完全不能) able to _(满足那个需求). _, there is still a long way to find a suitable(suit) solution _ puts _(足够的) food on the dinner table _ keeping people and the environment as healthy as possible.UNIT 5 WORKING THE LANReading for WritingChemical Versus Organic FarmingChemical pesticides(杀虫剂) and artificial fertilizers(化肥) have been(be) in wide spread use(广泛使用) in farming since the middle of the 20th century. When they were first introduced(introduce), many farmers welcomed them as a great way to fight(fight) crop disease and increase production(增加产量). Over time, however, what some scientists have found is that(科学家们发现的是) their long-term use(长期使用) can sometimes harm both the land and peoples health.For example, pesticides can damage the land by killing not only harmful bacteria and insects, but also helpful ones(one). In addition, these chemicals can stay in the soil and underground water sources(地下水系统) for a long time. This affects the crops grown(grow) on the land and, in turn(转而，反过来), the animals and humans who digest them. Many people worry that these chemicals may make them ill(使他们生病) and even cause cancer(引发癌症). In fact, some pesticides like DDT have been prohibited(prohibit) in most countries because of the damage they cause to(他们引起的伤害) people and the environment. As for chemical fertilisers, crops grown(grow) with them usually grow too fast to be(be) rich in nutrition. They may look beautiful on the outside, but inside there is usually more water than essential(必须的) minerals, and they often have less(little) flavour as well.As an alternative(作为一个替代选择), some farmers have switched to(转向) organic farming, and many customers h