首页
登录
职称英语
A project likely to evolve in the near or intermediate future isspace touri
A project likely to evolve in the near or intermediate future isspace touri
游客
2023-11-29
47
管理
问题
A project likely to evolve in the near or intermediate future is
space tourism. Today space tourism has become a pure commercial【S1】______
activity that would not have to rely unpredictable government【S2】______
decisions. It would therefore put space operations on a much more
solid, dependable footing and would enormously expand man’s space
activity. If some people see space tourism as a potential multibillion-【S3】______
dollar business, difficult technical problems remain to be sobered.
First, in order to fulfill the dream of space tourism, a
manned reusable rocket like the Venture Star must be built.
Then, the second serious problem must be addressed; Even【S4】______
today’s most-advanced space rockets are able to lift only about
2. 5% of their launch weight into orbit—a ratio that has hardly
changed in the last 40 years. But it is simply impossible to find【S5】______
other alternations other than a rocket. This unsatisfying fact is a【S6】______
result of the limits of material characteristics and chemical power
sources, and there is no indication which any fundamental【S7】______
breakthrough can be expected in these areas in the foreseeable
future. Then these who have long-cherished dreams of space tourism【S8】______
have to wait forever.
Operational costs may be somewhat reduced by the use of air-
breathing engines to help a reusable rocket penetrate into earth’s
atmosphere. Today the highest cost attainable to lift a payload to【S9】______
orbit is more than $ 4,000 per pound; the price of a ticket to space
would have to be at least $ 50,000. It is questionable whether a
sufficient number of customers could be tempted to pay so a high【S10】______
price for a short trip around the world. [br] 【S6】
选项
答案
alternations一alternatives
解析
形近词误用。alternation表示“交替,轮流,间隔”,alternative表示“可供选择的事物”,此处说“找不到可以替代火箭的东西”,因此用alternatives。
转载请注明原文地址:https://tihaiku.com/zcyy/3228144.html
相关试题推荐
PassageFour[br]Whatisthispassagemainlyabout?Thedevelopmentandfutureo
PassageFour[br]WhatseemstobeaneffectofthepilotprojectinSpain?Tohe
Womenweremorelikelythanmentoreporthavingunderstandingsaboutsafer
Womenweremorelikelythanmentoreporthavingunderstandingsaboutsafer
Womenweremorelikelythanmentoreporthavingunderstandingsaboutsafer
Womenweremorelikelythanmentoreporthavingunderstandingsaboutsafer
Womenweremorelikelythanmentoreporthavingunderstandingsaboutsafer
Womenweremorelikelythanmentoreporthavingunderstandingsaboutsafer
Youngpeoplearefacinganuncertainfuture.Asthe21stcenturydawned,the
Youngpeoplearefacinganuncertainfuture.Asthe21stcenturydawned,the
随机试题
"Dimpy,"asherfriendscallher,heardaboutthehazardsofsmokinginheal
Thereisonepartofwomen’smagazinesthateverymanreads.Itisthesect
Americansoftensaythatthereareonlytwothingsapersoncanbesureofi
给高热病人使用冰袋以增加散热是通过( )A.辐射 B.传导 C.对
程序设计语言一般可划分为低级语言和高级语言两大类,与高级语言相比,用低级语言开发
肾小球肾炎的主要临床表现A.血尿 B.蛋白尿 C.水肿 D.高血压 E.
()是中国变法之始,在中国历史上产生了深远的影响。A.商鞅变法 B.吴起变法
A.水解乙酰胆碱 B.抑制凝血酶 C.特异地与球蛋白结合 D.专与血红素结
2013年9月,税务机关对甲公司进行税务稽查时发现,甲公司2012年度的企业所得
关于三方协议的说法,正确的有( )。A.三方协议由毕业生、用人单位、毕业生所在
最新回复
(
0
)