首页
登录
职称英语
Why did the sugar cane farmers bring cane toads to Australia? [br] [originaltex
Why did the sugar cane farmers bring cane toads to Australia? [br] [originaltex
游客
2023-11-04
31
管理
问题
Why did the sugar cane farmers bring cane toads to Australia? [br]
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:http://tihaiku.com/zcyy/3156835.html
相关试题推荐
Whatistheeventualeffectofthebehaviorofthebank?[originaltext]Finan
Nigeria’sNationalSecurityAdviserhasbeenfiredbecause[br][originaltext]
Nigeria’sNationalSecurityAdviserhasbeenfiredbecause[originaltext]Nig
Sevenpeoplewerearrestedbecause[originaltext]PoliceintheIrishRepubli
______senatorsvoteforthebill.[originaltext]TheUnitedStatesSenateha
Theproposalisaimingat[br][originaltext]VotersinSwitzerlandhaverej
JohnWilliams’houseismadeof[br][originaltext]Morethan40yearsago,
Whatdoesatrainingspecificationspecify?[br][originaltext]Asweknow,
Whatdoesatrainingspecificationspecify?[br][originaltext]Asweknow,
Whatdoesatrainingspecificationspecify?[originaltext]Asweknow,itis
随机试题
Tomarkitsonehundredthanniversary,theuniversityheldaseriesofactivitie
[originaltext]Howmuchwatershouldyoudrinkeachday?It’sasimplequest
Thelab_____nextyearwillbemoreadvancedthantheoldone.A、tobebuiltB、b
对计算机评价的主要性能指标有时钟频率、(请作答此空)、运算精度、内存容量等。对数
某女,65岁。咳喘十五年,每至冬季加重,面色淡白,咳声无力,动则气喘,痰清稀色白
共用题干 LifeConnectedWithComputerAfter
断路器手车(隔离手车)在()位置转换时,本间隔断路器应在分位(A)工作(B
治疗呕吐时具有宽胸理气,降逆止呕的作用的为A.中脘 B.内关 C.足三里
当构件设计是按最小配筋率配筋时,可按钢筋的()相等的原则代换。A.强度
深层搅拌水泥土围护墙的主要特点是()。A.施工中振动与噪声较大 B.坑内需设支
最新回复
(
0
)