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
A、Importance of biodiversity. B、Protection of wild species. C、Farm pollution. D、Agricultural methods. A
A、Importance of biodiversity. B、Protection of wild species. C、Farm pollution. D、Agricultural methods. A
admin
2016-11-09
40
问题
An environment that is biologically diverse has lots of different plants and animals. This is needed for people to have enough high-quality food to lead active and healthy lives.
The idea of biodiversity recognizes that natural systems are complex and depend on one another.
In agriculture, depending on only a few crops can be dangerous. One example is the Great Potato Famine in the eighteen forties. Ireland depended on potatoes as a food resource. But a disease ruined the crop for several years. More than one million people died from hunger.
Yet experts say the world depends on only four crops to provide half its food energy from plants. These are wheat, maize, rice and potato. The experts say it is important to support a large number of different food crops and farm animals that can survive different conditions. Such diversity helps to reduce the risk from losing one main crop.
Farmers also have a responsibility to protect wild species. The Food and Agriculture Organization says more than forty percent of all land is used for agriculture. Farm fields are an important place for wild animals to live and reproduce. Also, farmers must consider the effects that agriculture has on the environment. Farm pollution or poor agricultural methods can harm wetlands, rivers and other environments needed to support life.
Invasive species are a severe threat to biodiversity. Plants and animals often spread without natural controls when they enter areas they are not native to. They can destroy crops, native species and property. Invasive species cost the world economy thousands of millions of dollars each year.
Q13: What does this report mainly talk about?
Ql4: According to experts, what are the four crops the world chiefly depends on?
Q15: Why are invasive species a severe threat to biodiversity?
选项
A、Importance of biodiversity.
B、Protection of wild species.
C、Farm pollution.
D、Agricultural methods.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/GUHO777K
0
研究生英语学位课统考(GET)
相关试题推荐
Exceptionalchildrenaredifferentinsomesignificantwayfromothersofthesameage.Forthesechildrentodeveloptotheirf
Whenprehistoricmanarrivedinnewpartsoftheworld,somethingstrangehappenedtothelargeanimals.Theysuddenlybecameex
WhenLiamMcGeedepartedaspresidentofBankofAmericainAugust,hisexplanationwassurprisinglystraightup.Ratherthancl
OurculturehascausedmostAmericanstoassumenotonlythatourlanguageisuniversalbutthatthegesturesweuseareunderst
Thebeliefthatthemindplaysanimportantroleinphysicalillnessgoesbacktotheearliestdaysofmedicine.Fromthetimeo
TheInternetcanmakethenewsmoredemocratic,givingthepublicachancetoaskquestionsandseekoutfactsbehindstoriesan
Heaskedmetolendhimsomemoney,whichIagreedtodo,______thathepaidmebackthefollowingweek.
Ithasbeenrevealedthatnearlyoneinfivedegreecourseshasbeen______sincethetriplingoftuitionfeesto£9,000ayear.
______hisseemingrebellionagainstmiddle-classvalues,heremainsessentiallymiddle-class.(中国科学院2013年10月试题)
Sometimescertainfamiliesadhered______thesamereligiousbeliefsforseveralgenerations.(中国科学院2013年3月试题)
随机试题
多义词是对一个词而言,同音词是对一组词而言。()
体内CO2分压最高的是()
在下列化合物中不能进行加成反应的是()。
酸雨是指PH值低于5.6的大气降水。造成酸雨的主要原因是大气中的()
下列说法正确的是()。1991年,上海市政府财政年支出占1990年城市GDP的百分比为()。
信用卡诈骗罪中,“冒用他人信用卡”的情形有
2022年3月3日晚,《感动中国2021年度人物颁奖盛典》在中央广播电视总台播出。其中有一位获奖者是卫生健康系统的杰出代表,他就是青海省心脑血管病专科医院原研究员、中国工程院院士()。2021年,他荣获党内最高荣誉“七一勋章”。
下列关于网络的叙述中,错误的是
WherewasJohnandhiswife’srestaurant?
AA--businesscircleB--businessconditionsC--businesshoursD-
最新回复
(
0
)