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
2013-09-28
81
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、Their houses were destroyed by cane beetles.
B、Cane beetles dropped their eggs onto the ground around the base of the plant.
C、Cane beetles killed all their livelihood.
D、Their sugar cane plants were ruined by overwhelming beetles.
答案
D
解析
文中提到,在30年代中期,蔗虫泛滥(there was a serious outbreak of the cane beetle),这让农夫们很绝望,因为它们毁掉了农夫们的营生(ruining their livelihood),即甘蔗,故答案为[D]。
转载请注明原文地址:https://kaotiyun.com/show/e3LK777K
0
专业英语四级
相关试题推荐
Thedeclineinmoralstandards—whichhaslongconcernedsocialanalysts—hasatlastcapturedtheattentionofaverageAmericans.
Supposeyouaredrivingonahighwaywiththreelanesgoinginyourdirectionandyoucomeuponatollplazawithsixtollbooth
Culturalnormssocompletelysurroundpeople,sopermeatethoughtandactionthatweneverrecognizetheassumptionsonwhichth
Giventhebriefestofglancesatapicture,mostpeoplebelievetheyhavenothadtimetorecognizeanythinginitatall.Askt
Toaccompanythesongs,NativeAmericansused_______.
"Brazilhasbecomeoneofthedevelopingworld’sgreatsuccessesatreducingpopulationgrowth—butmorebyaccidentthanbydesi
Asthecostofgasandoilforhomeheatinghasgoneup,manyAmericanshaveswitchedfromthesefuelstowoodforheatingtheir
Whatmakesitpossibletowithdrawordepositmoneyinscatteredlocations?
Someoftheircompetitorshavewithdrawn______ofingeniousplansandcourage.
随机试题
患者,男性,62岁,下颌牙列缺失,欲行全口义齿修复,不必做的检查是
癫部分性发作,不包括:()
下列关于浸提方法应用的叙述,不正确的是
男,18岁,高三学生。既往学习成绩一贯优良,品德良好。据父母反映该生近半年来,可能因为学习任务太重,高考压力太大,出现学习成绩明显下降,且变得孤僻不与人交往,对父母态度冷漠又粗暴,失眠,有时自语自笑。精神检查时,该学生回答问题语词单调,对上述表现回答说压力
下列各项中,符合营业税计税依据规定的是()。
甲、乙、丙三个工程队完成一项工作的效率比为2:3:4。某项工程,乙先做了后,余下交由甲与丙合作完成,3天后完成工作。问完成此工程共用了多少天?()
“禁止看电视”是操作条件作用中的()。
软件开发环境的核心是(31)。软件开发环境具有集成性、(32)、可裁减性、数据格式一致性、风格统一的用户界面等特性,因而能大幅度地提高软件生产率。
如果要在已经打开的窗体上的某个字段中用宏操作FindRecord进行查找定位,首先应该进行的操作是
如果要将"职工"表中年龄大于60岁的职工修改为"退休"状态,可使用的查询是
最新回复
(
0
)