首页
登录
职称英语
[originaltext] Spaceships travel around the earth, go to the moon, and retur
[originaltext] Spaceships travel around the earth, go to the moon, and retur
游客
2023-07-22
17
管理
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、Space Travel.
B、Problems of Astronauts.
C、Water Pollution.
D、The Spaceship Earth.
答案
D
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/2858582.html
相关试题推荐
[originaltext]TheCanadianThanksgivingmakesaninterestingcounterpointt
[originaltext]TheCanadianThanksgivingmakesaninterestingcounterpointt
[originaltext]W:I’mgladthatyouhavedecidedtotakealook.It’sabeautifu
[originaltext]M:Gregspeaking.W:Greg,it’sJane.M:Heythere,howareyou?
[originaltext]M:Gregspeaking.W:Greg,it’sJane.M:Heythere,howareyou?
[originaltext]M:Gregspeaking.W:Greg,it’sJane.M:Heythere,howareyou?
[originaltext]M:Haveyoufinishedyet?W:Almost.Ijusthavetogettheselas
[originaltext]M:Haveyoufinishedyet?W:Almost.Ijusthavetogettheselas
[originaltext]M:Haveyoufinishedyet?W:Almost.Ijusthavetogettheselas
[originaltext]M:Haveyoufinishedyet?W:Almost.Ijusthavetogettheselas
随机试题
[originaltext]Thisweek,leadersofthetopindustrialanddevelopingecono
PASSAGETHREE[br]WhowasAylanKurdiandwhathappenedtohim?HewasaSyria
设随机变量X~U[-1,1],则随机变量U=arcsinX,V=arccosX的
一个用于发送二进制信号的信道带宽为3kHz,其信噪比为20dB,那么,最大数
空调系统的节能运行工况,一年中新风量的变化情况是()。A.冬、夏最小,过渡季
患者,女性,46岁,左下后牙2个月来遇冷、热过敏,食物嵌入牙内引起隐隐不适,近2
下列不是泌尿系结石保守治疗的方法是A.口服排石中药 B.解痉 C.利尿 D
下列项目风险应对方法中,属于风险转移策略的有()A.购买保险B.开立信用证
2015年3月5日,李克强总理在第十二届全国人民代表大会第三次会议上所作的《政府
(2010年,河南)个体身心发展中起主导作用的是()。 A.遗传 B.学校教
最新回复
(
0
)