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
A、The present population on earth is fourteen billion. B、Water is recycled every seventy million years. C、The planet earth trave
A、The present population on earth is fourteen billion. B、Water is recycled every seventy million years. C、The planet earth trave
admin
2010-10-14
60
问题
Spaceships travel around the earth, go to the moon, and return home safely. The astronauts carry important supplies with them on the spaceship -- food, water, and air. Sometimes there are problems on the spaceship, and the astronauts have to understand how the spaceship works in order to repair the problems.
In a way, all of us are really on a spaceship, the planet Earth. We move around the sun at 18 miles per second and never stop. On our spaceship we have four billion people and a limited supply of air, water, and land. These sup- plies, just like the limited supplies on the astronauts’ spaceship, have to be used carefully because we can’t buy new air, water, or land from anywhere else. Everyone needs air, water, and land to live -- this is our environment.
The environment on our planet is a closed system; nothing new is ever added. Nature recycles its resources. Water, for example, evaporates and rises to form clouds. This same water returns to the earth as rain or snow. The rain that falls today is actually tile same water that fell on the dinosaurs 70 million years ago.
Over the years, people have changed the environment. We have poured back into the land, air, and water more wastes than nature can clean. So we have pollution today.
To continue to survive, we must learn how to use the Earth’s resources wisely; without destroying them. To save the spaceship Earth, we must cooperate with nature and learn better ways to use, not abuse, our environment.
选项
A、The present population on earth is fourteen billion.
B、Water is recycled every seventy million years.
C、The planet earth travels around the sun at 18 miles per second.
D、The earth is compared to a spaceship because they both travel around the sun.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/RK87777K
0
大学英语四级
相关试题推荐
A、Theyareplacesforpeopletoexchangetheirgoods.B、Theyareplacesforresidentstoheaptheuselessthings.C、Theyaresal
Accordingtoasurvey,whichwasbasedontheresponsesofover188,000students,today’straditional-agecollegefreshmenare"
A、Hewillmakeposters.B、Hewillwriteaspeech.C、Hewillanswerquestions.D、Hewillstudychemistry.B题目问男士今晚做什么。女士说在明天午餐时为男
A、TheybothliveinNewYork.B、TheybothknowJack.C、Theyarebothinterestedinmusic.D、Theybothenjoycamping.C题目问Laura和K
Longbusridesareliketelevisionshows.Theyhaveabeginning,amiddle,andanend-withcommercialsthrownineverythreeorfou
Participationinhighschoolsportsisnotaconstitutionalright.Rather,itisa【C1】______,paidforbytaxpayers,opentostu
Twopressingproblemsfacetheworld:economicmeltdownandglobalwarming.Conveniently,asolutionpresentsitselfthatappare
A、Itisbeingforcedoutoftheentertainmentindustry.B、Itshouldchangeitsconceptofoperation.C、Itshouldrevolutionizei
A、Thereareseriousproblemswithit.B、Therepairmanisnotavailablenow.C、Therearemanycarswaitingforrepair.D、Therepa
A、He’llaskStevenwhenhetalkstohim.B、HewantstoinvitetheJohnson’stocome.C、Heisn’tsurehowmanypeoplewillgo.D、
随机试题
毛泽东第一次正式提出“人民民主专政”的概念是在()中
关于血细胞成熟过程中形态演变的一般规律,错误的是
下列我国少数民族中,信奉伊斯兰教的有()。
刘老师担任某社会工作机构督导三年。开始半年的督导工作采用“专题讲座”方式,重点提升社会工作者的理论知识和专业技能。之后,刘老师让社会工作者提前一周将工作中的问题告诉她,她会针对问题在每个月的督导会上给予反馈和建议。关于刘老师督导方式转变的说法,正确的是(
清华大学校长在一次开学典礼上说:“学校不仅要给学生‘干粮’,更要给‘猎枪’”。“干粮”是指__________,“猎枪”是指__________,这句话强调了学习方法比知识更重要。
在中国古代诗人眼中,大雁经常被视为书信的代名词,鸿雁传书是他们最为向往的意象之一,下列诗句中的大雁形象代表这一意象的是()。
现有散装巧克力糖果40颗,要把它们分到6个包装盒里,要求每个包装盒里的巧克力糖果颗数都不一样,问装有巧克力糖果最多的包装盒里至少装有多少颗?()
下列选项中属于法定物权的是()。
Students’EvaluationofClassroomTeachingForthepasttwoyears,Ihavebeenworkingonstudents’evaluationofclassroomteac
Inapetshopthereare5hutchesinarow.Adifferentrabbitisineachhutch.Workout,fromtheclues,whereeachrabbitbel
最新回复
(
0
)