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For a herder ( 放牧人 ) in Africa, the hardest part of the job is searching for cows lost in the bush.But for Andrew, a herder at a farm in Zimbabwe, it ' s not a problem.Once he spots Toro, he knows the rest of the herd is nearby.That ' s because Toro isn ' t an ordinary member of the herd.He ' s a giraffe.In hot weather, cattle rest in the shade under his belly.And because of his height, Toro can spot lions long before they come close to the herd. Toro ' s unusual situation came about after his mother was killed by lions.Toro survived the attack, but he was left with no one to protect him or give him milk.About two days later, some herders spotted and rescued him.With the permission of the Department of Wildlife, the herders moved Toro to Andrew ' s farm.Since giraffes and cattle are both plant­eating animals that live in groups, their behaviors are much the same.Toro was accepted into the herd and wandered among the cattle as they ate grass. Toro doesn ' t always behave like the other members of his new herd.Like many kinds of animals, cattle compete for dominance ( 支配权 ) . Standing more than 13 feet tall, Toro is more than three times taller than the biggest bull.But Toro never tries to be “the boss” .“ He is very used to their company , ” Andrew said.When the herd enters the kraal ( 家畜栏 ), the cows and bulls push each other. “ But thanks to his height, Toro does not need to join the mess , ” said Andrew. When asked if Toro would ever be returned to the wild, Munetsi, an officer of the Department of Wildlife, said no. “ In the wild, he would find it difficult to be accepted into another herd or defend himself from predators ( 猎食者 ) , ” he added.“He seems very much at home and is respected by the cattle.”
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参考答案:
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【单选题】下列关于茎、皮类药材贮藏的叙述,正确的是()
A.
皮类药材以根皮为主
B.
采收加工、贮藏不善时易发生"走气"
C.
茎类药材较不容易发生霉蛀
D.
大多含有丰富的脂肪、蛋白质等,易遭鼠害
E.
皮类药材在贮藏中极易退色
【单选题】生态学家为了监测和预报该生态系统鼠害的发生情况,对弃耕后田鼠种群数量的变化规律进行了研究。下列关于群落演替的叙述不正确的是()
A.
演替是群落的根本性质发生变化的现象
B.
演替过程只要不遭到人类的破坏和各种自然力的干扰,其总趋势是物种多样性的增加
C.
只有群落的结构受到干扰或破坏时,才会出现群落的演替
D.
不论是成型的群落或是正在发展形成过程中的群落,演替现象一直存在着,并贯穿着整个群落发展的始终
【简答题】《旅游安全管理办法》规定“较大旅游突发事件”的范围?
【多选题】分子生物学的三大原则
A.
生物大分子单体的排列(核苷酸,氨基酸)导致了生物的个性
B.
生物遗传信息的表达的中心法则相同
C.
生物大分子一级结构决定高级结构
D.
构成生物大分子的单体是相同的
【单选题】二十世纪,分子生物学中的“中心法则”的结果的证明;遗传密码的破译,基因的奥秘被揭开了,同类物质循环繁衍的过程就是()
A.
DNA的自催化过程;
B.
DNA的异催化过程;
C.
蛋白质的形成过程;
D.
互补氢键的形成过程。
【单选题】下列有关生物学原理在生产中应用的叙述,正确的是 ( )
A.
农业生态系统中人们不断施肥、灌溉、播种等,目的是提高其抵抗力稳定性
B.
烟草释放挥发性物质驱除夜间活动的雌蛾,它们的关系是竞争
C.
控制鼠害的有效措施是降低环境容纳量
D.
抗虫棉由于导入的是生物毒素基因,所以棉铃虫不会产生针对抗虫棉的抗性
【单选题】下列关于鼠的作用的叙述不正确的是(  )
A.
鼠是生态系统中的一员
B.
鼠对人类有害,必须把它消灭尽,使之绝种
C.
鼠在帮助植物传播果实和种子,扩大植物的分布范围方面有一定的作用
D.
鼠在食物链或食物网中占据一环,过多过少对生态系统都会产生影响
【简答题】《旅游安全管理办法》规定“一般旅游突发事件”的范围?
【单选题】下列关于种群的叙述中不正确的是()。
A.
理想条件下,种群数量增长的数学模型是N t =Nλ t
B.
器械捕杀和药物捕杀是控制家鼠等有害动物的根本措施
C.
调查某种昆虫卵的密度和作物植株上蚜虫的密度可采用样方法
D.
利用性引诱剂诱杀害虫可改变害虫种群的性别比例使种群密度下降
【简答题】《旅游安全管理办法》规定“特别重大旅游突发事件”的范围?
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