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
Why did the sugar cane farmers bring cane toads to Australia?
Why did the sugar cane farmers bring cane toads to Australia?
admin
2015-06-27
24
问题
Why did the sugar cane farmers bring cane toads to Australia?
Perhaps the most unusual animal ever brought to Australia was the cane toad. It is a large and ugly species of toad and was imported to this country by sugar cane farmers in 1935 [18B] to get rid of the beetles which killed the sugar cane plants.
The cane beetle is the natural enemy of the sugar cane plant. It lives in the cane and drops its eggs onto the ground around the base of the cane. The eggs develop into worms and then the worms eat the roots of the cane, resulting in the death of the plant. In the mid 30s there was a serious outbreak of cane beetles and the farmers became desperate to get rid of the pest which was ruining their livelihood.
Meanwhile it was reported that a toad, native to Central America, had been taken to Hawaii, where cane is also grown, and introduced with apparent success. So the Australian farmers arranged to import one hundred toads from Hawaii. The toads were then released into the cane fields to kill cane beetles.
As predicted, the toads started to breed successfully and within a very short time their numbers had swollen. But there was one serious problem. It turned out that [20A] cane toads did not eat cane beetles. And the reason for this is that toads live on insects that are found on the ground and the cane beetle lives at the top of the cane plant well out of reach of the toads. In fact they never come into contact with each other.
选项
A、The cane toads did not eat the cane beetles.
B、The number of the cane toads had swollen.
C、There was another outbreak of the cane beetles.
D、The cane toads killed all the cane beetles.
答案
A
解析
短文结尾提到,澳大利亚看到夏威夷蔗农的成功样例后,决定引入蔗蟾,但是引入之后,问题也出来了,那就是蔗蟾(cane toads)并没有吃蔗虫(cane beetles),故答案为[A]。
转载请注明原文地址:https://jikaoti.com/ti/9BKMFFFM
0
专业英语四级
相关试题推荐
Whatisthisnewsitemmainlyabout?
RichAmericansarewillingtotakeconspicuousconsumptiontonewheightsbyspendingbigbuckstoflyintospace,includingpay
Watchingmepullingthecalfawkwardlytothebarn,theIrishmilkmaidfoughthardto______herlaughter.
Astheseachievementsindicate,/theJapanesestartedthewarawareofthefact/thatmajoroffensiveactioncannotbeunderta
Thefamilyofthevictimhadtoendurealongwaitbeforethecasecametotrial.Theunderlinedpartmeans___.
AlthoughOrientalideasofwoman’s______tomanprevailedinthosedays,shediddaretomeetwithmanonequalbasis.
Animalsthatcouldnot______themselvestothechangedenvironmentperishedandthosethatcouldsurvived.
Shynessisthecauseofmuchunhappinessforagreatmanypeople.Shypeopleare【C1】______andself-conscious;thatis,theyar
I’m_____aboutthefootballteam’schancesofwinning,butheabsolutelydisagreeswithme.
Janewasdeterminedto______herselfintheAfricanwayoflife.
随机试题
气血精髓亏虚,组织器官失其荣养所致疼痛,为经脉失养或阻滞不通所致疼痛,为
关于拔牙时力的应用下列说法错误的是
图5.7.3所示挡土墙高为4.5m,墙背倾斜(α=106°),墙背粗糙δ=6°,排水条件良好,墙后填土倾斜β=15°,填土表面无均布荷载,填料为粗砂,土的干密度ρ=1.67t/m3,γ=18kN/m3,内摩擦角φ=12°。按《建筑地基基础设计规范》作答。
安全生产的方针是( )。
审核无误的各类原始凭证是账簿登记的直接依据。()
影响可比产品成本降低率变动的因素有()。
下列教学目标属于“过程与方法”类目标的是()。
回首向来萧瑟处,归去,___________。(苏轼《定风波》)
A;WouldyouratherwatchTVorgoforawalk?B:TheTVprogramisgoodtoday.______A:Cool.Let’sgo.
Oneinsix.Believeitornot,that’sthenumberofAmericanswhostrugglewithhunger.Tomaketomorrowalittlebetter,Feedi
最新回复
(
0
)