首页
登录
职称英语
[originaltext] Since the beginning of history, people on the earth have alwa
[originaltext] Since the beginning of history, people on the earth have alwa
游客
2023-07-18
74
管理
问题
Since the beginning of history, people on the earth have always watched the sky and wondered about the things they saw. As centuries of discoveries flew by, it became obvious that humans would not be content to just gaze at the solar system. We wanted to fly into it and explore it as well.
Once again, technology allowed us to accomplish our goal. (33)On October 4, 1957. a Soviet rocket sent the first man-made satellite into space. It was called Sputnik, the Russian word for "traveler". Even though Sputnik was nothing more than a small aluminum ball with a radio inside, it started a whole new era of space exploration.
In May 1961 President John F. Kennedy challenged American scientists to land a person on the moon before the end of the 1960s. (34)In the quest to do this, scientists faced many obstacles. For example, to get a spaceship all the way to the moon and back would demand a rocket engine powerful enough to make the trip. (35)Scientists realized that it would be difficult for one heavy rocket loaded with fuel to reach the moon. Instead, they decided to use a multistage rocket. When the fuel in one stage of the multistage rocket is used up, that stage will fall away. This makes the rocket lighter, and the engine of the next stage can go on providing power and thrust the rocket even faster and higher. As you know, Americans successfully landed on the moon in July 1969. Since then our knowledge of the solar system has increased dramatically.
选项
A、How to make a powerful rocket engine.
B、How to ensure the safety of the crew.
C、How to choose qualified crewmen for the trip.
D、How to enable the spacecraft break free of gravity.
答案
A
解析
听力中提到,准备登月行动行动时,科学家们面临许多障碍,其中最关键的问题是a rocket engine powerful enough to make the trip,即一个动力足够强大的能够完成旅程的火箭推进器,所以本题的正确答案为A。
转载请注明原文地址:https://tihaiku.com/zcyy/2847471.html
相关试题推荐
[originaltext]Fewbuildingsonearthcancompetewiththelegendarybeauty
[originaltext]Fewbuildingsonearthcancompetewiththelegendarybeauty
[originaltext]Fewbuildingsonearthcancompetewiththelegendarybeauty
[originaltext]TheFrenchareathearttraditionalists.Thoughtheydearlyl
[originaltext]TheFrenchareathearttraditionalists.Thoughtheydearlyl
[originaltext]TheFrenchareathearttraditionalists.Thoughtheydearlyl
[originaltext]Peoplewhobuysharesofstockinacompanymaymakemoneyin
[originaltext]Peoplewhobuysharesofstockinacompanymaymakemoneyin
[originaltext]W:Whatdoyouplantodoafteryoufinishyouruniversitywork?
[originaltext]W:Bill,isthatreallyyou?Ihaven’tseenyouformonths.M:He
随机试题
Faces,likefingerprints,areunique.Didyou【C1】______wonderhowitisposs
[originaltext]W:Youwon’tbeabletofinishtheprojectinamonth.M:Tomdid
MightyFlightyAflycandoonethingextremelywell:
下列非我国城乡规划的要求的是:( )A.优先规划城市 B.利用现有条件 C
无牙颌患者的口内特征为() A.牙列缺失 B.牙冠缺损 C
当存在如下哪些因素时,应审慎评估基金产品的风险。() Ⅰ.存在本金损失的可能
对用于投切电容器组等操作频繁的开关柜要适当缩短巡检和维护周期。当无功补偿装置容量
某国议员认为:“只要提高工人工资就会导致通货膨胀。如果发生通货膨胀,那么人民就会
下列关于城市规划中公众参与的表述,错误的是( )。A.现代城市规划具有咨询和协
A.头孢他定 B.头孢拉定 C.甲硝唑 D.氯霉素 E.红霉素治疗厌氧菌
最新回复
(
0
)