首页
登录
职称英语
A project likely to evolve in the near or intermediate future is spacetouri
A project likely to evolve in the near or intermediate future is spacetouri
游客
2023-11-24
49
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 activity【S1】________
that would not have to rely unpredictable government decisions. It would【S2】________
therefore put space operations on a much more solid, dependable footing
and would enormously expand man’s space activity. If some people see【S3】________
space tourism as a potential multibillion—dollar business, difficult
technical problems remain to be solved.
First, in order to fulfill the dream of space tourism, a manned
reusable rocket like the Venture Star must be built. Then, the second【S4】________
serious problem must be addressed:Even today’s most—advanced space
rockets are able to lift only about 2. 5%of their launch weight into
0rbit—a ratio that has hardly changed in the last 40 years. But it is【S5】________
simply impossible to find other alternations other than a rocket. This【S6】________
unsatisfying fact is a result of the limits of material characteristics and
chemical power sources, and there is no indication which any【S7】________
fundamental breakthrough call be expected in these areas in the
foreseeable future. Then these who have long-cherished dreams of space【S8】________
tourism have to Wait forever.
Operational costs may be somewhat reduced by the use of air-
breathing engines to help a reusable rocket penetrate into the earth’s
atmosphere. Today the highest cost attainable to lift a payload into orbit【S9】________
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 price for a short【S10】________
trip around the world. [br] 【S1】
选项
答案
pure—purely
解析
词性混用。这里pure修饰形容词commercial,因此应该使用其副词形式purely,表示“纯粹的商业活动”。
转载请注明原文地址:http://tihaiku.com/zcyy/3214066.html
相关试题推荐
PassaqeTwo(1)Oneoftheobviousproblemswithpredictingthefuture
PassaqeTwo(1)Oneoftheobviousproblemswithpredictingthefuture
PassaqeTwo(1)Oneoftheobviousproblemswithpredictingthefuture
PassageThree[br]Whatdoestheauthormeanbysaying"Itsfuturecannows
PeoplewhohaveInternetaccessathomearemorelikelytobeinarelation
PeoplewhohaveInternetaccessathomearemorelikelytobeinarelation
PeoplewhohaveInternetaccessathomearemorelikelytobeinarelation
Predictingthefutureisariskybusinessforascientist.Itissafetosay
Predictingthefutureisariskybusinessforascientist.Itissafetosay
Predictingthefutureisariskybusinessforascientist.Itissafetosay
随机试题
AccordingtotheSapir-WhorfHypothesis,ifaculturehasmoreexpressionsforc
ItriedveryhardtopersuadehimtojoinourgroupbutImetwithaflat______.
在空气中做牛顿环实验,如图所示,当平凸透镜垂直向上缓慢平移而远离平面玻璃时,可以
石墨烯(Graphene)是一种从石墨材料中剥离出来、由单层碳原子构成的六角形蜂
根据《合同法》规定,接受定金的一方不履行约定的,应当()。A.将定金抵作价款
某教育局对全县小学生调查:最喜欢的日子是哪一天?超八成学生回答:“最喜欢无作业日
1992年10月20日某中学134名学生发生食物中毒,经调查20日中餐供应的豆角
一般期末无余额的账户有()。A.收入类账户 B.费用类账户 C.利润账户
C
建立施工项目成本管理制、开展成本控制的基础是()A.成本预测 B.成本计划
最新回复
(
0
)