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
What does the speaker mainly discuss?
What does the speaker mainly discuss?
admin
2018-03-16
81
问题
What does the speaker mainly discuss?
I want to talk today about some studies. They seem to indicate that there is a startling world-wide decline in the number of amphibians, such as frogs, toads and salamanders. There’s little doubt that one reason why the number of amphibians is declining is their habitats have been destroyed when the developers fill in ponds and marshes to build houses. Amphibians can’t just move somewhere. They need water to lay their eggs in. Another problem is the growing fish industry. Another range of popular pool fish such as carp have been introduced to many lakes and ponds all over the world. Raising and selling these fish can be profitable, but the fish eat the eggs and offspring of amphibians that were already living in the lakes and ponds. Other factors could be contributing to the decline include acid rain and the spread of pesticide residues. Many pesticides that farmers added to their crops are eventually washed away by the rain and end up in ponds and other bodies of water where amphibians live. Amphibians are especially vulnerable to pesticides dissolved in the water because of their moist skins. Water can pass through amphibians allowing toxins dissolved in the water to enter the amphibians’ body.
选项
A、The distribution of different species of amphibians.
B、Possible reasons for reduction in the number of amphibians.
C、The effects of environmental change on the fish industry.
D、Guidelines for the responsible use of pesticides.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/vPWd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
Howmanylanguagesareusedthroughouttheworldtoday?
InJapanyoushouldholdabusinesscardwith______andreadthenameandriflecarefully.
BillGatesistherichestprivatecitizenintheworld.Thereisnothinghecan’t(31).Everymorning,whenhisalarmclockgoes
Theenvironmentiseverythingthatsurroundsusandcanaffectusinsomeway.
______hasadriverseatthatcanbeadjustedtofitmostpeople?______hasthebestenginedesignintermsofsayingmoney?
InBritain,theHouseofCommonsisarepresentativeassemblyelectedbyvotersorelectorsthroughageneralelectionandby-el
Impatiencecharacterizesyoungintellectualworkers.Theywanttomaketheirmark(31).Soit’simportanttoget(32)tothemin
Impatiencecharacterizesyoungintellectualworkers.Theywanttomaketheirmark(31).Soit’simportanttoget(32)tothemin
Impatiencecharacterizesyoungintellectualworkers.Theywanttomaketheirmark(31).Soit’simportanttoget(32)tothemin
Therelationshipbetweenthehomeandmarketeconomieshasgonethroughtwodistinctstages.Earlyindustrializationbeganthep
随机试题
柴油机的有效转矩Me主要取决于每循环供油、指示热效率和机械效率。()
氯化铵受热时能分解生成氨气和氯化氢,遇冷后又生成氯化铵,这不是升华现象。
吊销《化妆品生产企业卫生许可证》的决定机构是
紫外分光光度法英文缩写为
治疗气血亏虚之眩晕的主方应选
1993年国际劳工组织(ILO)通过的《预防重大工业事故公约》中定义事故为“在重大危险设施内的一项生产活动中突然发生的、涉及一种或多种危险物质的严重泄漏、火灾、爆炸等导致职工、公众或环境急性或慢性严重危害的事故”,并将重大事故划分的类型有()。
依据《行政处罚法》的规定,行政机关根据当事人的申请,决定举行听证的,听证的费用由()承担。
下列程序中,属于对一般费用的实质性程序的有()。
F—P腔激光器从结构上划分,可分为()。
窗体上有一个名称为Command1的命令按钮,其单击事件过程如下:OptionBase1PrivateSubCommand1_Click()Dima(4,4)AsIntegerFori=1To4
最新回复
(
0
)