首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Agricultural pests are winning the battle against the poisonous chemicals in pesticides. As each new chemical pesticide is used,
Agricultural pests are winning the battle against the poisonous chemicals in pesticides. As each new chemical pesticide is used,
admin
2011-02-28
35
问题
Agricultural pests are winning the battle against the poisonous chemicals in pesticides. As each new chemical pesticide is used, the insects or rodents gradually become used to it. The pests change themselves so that they are not killed by the poison. Therefore, farmers, scientists, and food planners are trying a new method to control the pests that attack their crops, This method is called Integrated Pest Management or IPM.
Integrated Pest Management is a plan that combines several different methods to destroy insects and rodents. These methods are specifically developed for individual areas and crops. The control methods include using the pests’ natural enemies, controlling the pests’ breeding environment, and developing stronger varieties of seeds. Chemical poisons are used only when necessary. The IPM method accepts the fact that it is useless to try to destroy pests completely with chemical poisons. Its aim is to control pest populations so that crops can still grow well.
Cotton farmers in Texas have been using the IPM method; The farmers find the best combination of control methods for their needs. In this way, they can produce crops without using too many chemical poisons. In 1977, three quarters of Texas cotton fields received no insecticides at all. That year’s cotton crop was better than average. The IPM methods showed the farmers a better way to control the pests in their fields.
The United Nations Environment Program(UNEP)has been studying agricultural pests and chemicals. It has found that 223 pests are resistant to, or not affected by, insecticides. Rodents, including rats, are also gaining resistance to poisons. In 1965, another UN organization, the UN Food and Agricutural Organization, listed 182 resistant types of pests. Three years later, there were 228 species on the resistant list. The 1977 survey raised the number to 364 species. Because so many pests are becoming resistant to chemical poisons, it is necessary to find another method of control. By using Integrated Pest Management, farmers can still control and limit pests without depending on chemical poisons.
IPM is a plan that______.
选项
A、uses the pests’ natural enemies
B、controls the pests’ breeding environment
C、develops stronger strains of seeds
D、does all of the above
答案
D
解析
参看第二段第三句。这种控制方法包括:使用农害物的天敌(与答案[A]相符),控制农害物的繁殖环境(与答案[B] 相符),培育生命力更强的农作物种系,(与答案[C]相符)。所以[D]为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/J8td777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
PaulJohnson’sAHistoryOfTheAmericanPeopleiswhatwehavecometoexpectfromthisproductivewriter—clear,colorfulnarra
poisonous
Somedoctorsaretakinganunusualnewapproachtocommunicatebetterwithpatients—theyareletting【C1】______readthenotestha
Somedoctorsaretakinganunusualnewapproachtocommunicatebetterwithpatients—theyareletting【C1】______readthenotestha
Somedoctorsaretakinganunusualnewapproachtocommunicatebetterwithpatients—theyareletting【C1】______readthenotestha
Somedoctorsaretakinganunusualnewapproachtocommunicatebetterwithpatients—theyareletting【C1】______readthenotestha
Theauthorsattributeeachtower’scollapsetothreeseparatebutrelated"loadingevents".【T1】ThefirsteventwasaBoeingair
Manyyearsagowhenthesummersseemedlongerandlifewaslesscomplicated,wehadrentedacottage【C1】______ariverinthehea
随机试题
依据《金属非金属矿山禁止使用的设备及工艺目录》(第一批及第二批),金属非金属矿山可选用的设备或工艺为()。
火灾报警控制器能发出区别于环境声、光的火灾报警信号,警示人们迅速进行安全疏散和采取火灾扑救措施。()
促进振动病发生的重要外界条件是
红细胞内叶酸含量测定低于
任何金融工具都可能出现由资产价格或指数变动导致损失的可能性,这是()。
研究表明:如果人长期在95分贝的噪声环境里工作和生活,大约有29%的人会丧失听力;即使噪声只有85分贝,也有10%的人会发生耳聋;120~130分贝的噪声,能使人感到耳内疼痛;更强的噪声会使听觉器官受到损害。有检测表明:当人连续听摩托车声,8小时以后听力就
Alawyerneedsa(n)______secretary.
已知函数f(x)=x2ln(1-x),当n≥3时,f(n)(0)=().
学生的记录由学号和成绩组成,N名学生的数据已在主函数中放入结构体数组s中,请编写函数fun,它的功能是:把分数最低的学生数据放在b所指的数组中,注意:分数最低的学生可能不止一个,函数返回分数最低的学生的人数。注意:部分源程序在文件PROG1.C文
It’scommonsensethat____________________.(商务信函应以正式文体书写而不是以么人风格书写).
最新回复
(
0
)