首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
Operation Migration If you look up at the sky in the early fall in the nort...
Operation Migration If you look up at the sky in the early fall in the nort...
admin
2020-12-24
39
问题
Operation Migration
If you look up at the sky in the early fall in the northern part of North America, you may see groups of birds. These birds are flying south to places where they can find food and warmth for the winter They are migrating (迁徙).The young birds usually learn to migrate from their parents. They follow their parents south. In one unusual case, however, the young birds are following something very different. These birds are young whooping cranes, and they are following an airplane!
The whooping crane is the largest bird that is native to North America. These birds almost disappeared in the 1800s. By 1941,there were only about 20 cranes alive. In the 1970s, people were worried that these creatures were in danger of disappearing completely. As a result, the United States identified whooping cranes as an endangered species that they needed to protect.
Some researchers tried to help. They began to breed whooping cranes in special parks to increase the number of birds. This plan was successful. There were a lot of new baby birds. As the birds became older, the researchers wanted to return them to nature. However, there was a problem:These young birds did not know how to migrate. They needed human help.
In 2001, some people had a creative idea. They formed an organization called Operation Migration. This group decided to use very light airplanes, instead of birds, to lead the young whooping cranes on their first trip south. They painted each airplane to look like a whooping crane. Even the pilots wore special clothing to make them look like cranes. The cranes began to trust the airplanes, and the plan worked.
Today, planes still lead birds across approximately 1,200 miles (1,931 kilometers), from the United States-Canadian border to the Gulf of Mexico. They leave the birds at different sites. If a trip is successful, the birds can travel on their own in the future. Then, when these birds become parents, they will teach their young to migrate. The people of Operation Migration think this is the only way to maintain the whooping crane population.
Operation Migration works with several other organizations and government institutes. Together, they assist hundreds of cranes each year. However, some experts predict that soon, this won’t be necessary. Thanks to Operation Migration and its partners, the crane population will continue to migrate. Hopefully, they won’t need human help any more.
If Operation Migration is successful,whooping cranes will{pz_填空} .
选项
A follow airplanes south every year
B live in Canada all year round
C be unable to fly back
D learn to migrate on their own
答案
D
解析
由最后一段可知,如果该计划成功的话,小美洲鹤就能学会自己迁徙,这也是这一计划的目的。
转载请注明原文地址:https://ti.zuoweng.com/ti/5vpQKKKQ
相关试题推荐
OperationMigration Ifyoulookupattheskyintheearlyfallinthenort...
OperationMigration Ifyoulookupattheskyintheearlyfallinthenort...
OperationMigration Ifyoulookupattheskyintheearlyfallinthenort...
OperationMigration Ifyoulookupattheskyintheearlyfallinthenort...
OperationMigration Ifyoulookupattheskyintheearlyfallinthenort...
OperationMigration Ifyoulookupattheskyintheearlyfallinthenort...
OperationMigration Ifyoulookupattheskyintheearlyfallinthenort...
ImmigrationandProblems Hundredsofthousandsofpeoplesupportingimmigrat...
ImmigrationandProblems Hundredsofthousandsofpeoplesupportingimmigrat...
共用题干 第三篇OperationMigrationIfyoulookupattheskyintheearlyfallinth...
随机试题
小儿断奶时间宜在 A.2~3个月 B.4~5个月 C.6~7个月 D.8
影响项目选址的区域因素不包括()。
一幢十层教学楼,采用全现浇钢筋混凝土框架结构体系,抗震设防烈度为8度,设计地震分
商业银行计算杠杆率时,属于核心一级资本扣减项的有( )
共用题干 HospitalMistreatmentAccordingto
符合肾结核的描述是
某公司准备建立一项为期10年的奖励基金,用于奖励有突出贡献的员工,每年几乎颁发
代理报检企业的代理报检业务档案保存期限为()。 A.1年 B.2年 C
进入了一家社会工作机构工作,督导老徐向他介绍了机构的相关情况后,给他安排了接下来的工作,包括服务个案量、工作完成时间安排与管理等。老徐的督导内容属于()。A:行
根据个人住房贷款的相关规定,借款人若要变更还款方式,需满足的条件有()。A.向银行提交还款方式变更申请书B.借款人已办妥正式抵押登记手续C.借款人的贷款账