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 project likely to evolve in the near or intermediate future is space tourism. Today space tourism has become a pure commercial
A project likely to evolve in the near or intermediate future is space tourism. Today space tourism has become a pure commercial
admin
2018-05-25
52
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.
【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://kaotiyun.com/show/jeoK777K
0
专业英语八级
相关试题推荐
SurvivalofEnglishLanguageI.Introduction—Englishwidespreadin【T1】______【T1】______—【T2】______show(s)howEnglishsurvived【
SurvivalofEnglishLanguageI.Introduction—Englishwidespreadin【T1】______【T1】______—【T2】______show(s)howEnglishsurvived【
UnderstandingTypesofPoemsI.EpicpoemsA.Definition:—anarrativeconcentratingon【T1】______andeventsthataresignificant
A、Theycanprovidebetterservicewithlowerprice.B、Theycanprovidebetterservicewithhigherprice.C、Theycanprovidethe
A、Ithasadoptedmanynewsafetypolicies.B、Ithasgotagreateconomicresult.C、Itfunctionspoorlyduetoalackoffunding.
A、Toshowthatstudentshavetodoalotofprojectwork.B、Toshowthatthebasketballstyleisnotalwaysapparent.C、Toshow
Itwouldhavebeenimpossible,completelyandentirely,foranywomantohavewrittentheplaysofShakespeareintheageofSha
Oneoftheobviousproblemswithpredictingthefutureeffectsofclimatechangeisthattheyhaven’thappened.Thismakesclima
PassageThreeWhichuniversityimprovethemostintop10?
Besidesconcernsabouthowadsaffectindividuals,criticshaveraisedethicalissuesabouthowadvertisingaffectssociety.F
随机试题
下列各项中,不属于足太阴脾经的腧穴是
A.溶液型气雾剂 B.乳剂型气雾剂 0C.喷雾剂 D.混悬型气雾剂 E.吸入粉雾剂借助于手动泵的压力将药液喷成雾状的制剂
患者,女,60岁,劳动、行走或咳嗽时阴道内有物脱出,小腹坠痛,四肢无力,少气懒言,面色无华,小便频数,舌质淡,苔薄,脉虚细。诊断为轻度子宫脱垂,治疗的最佳方剂为( )
属于医德活动现象的是( )。
Ag(DDC)法检查砷盐所需试剂有
安全评价方法中,事件树分析是用来分析普通设备故障或过程波动导致事故发生的可能性。其分析步骤包括()。
我国专利法规定,发明专利权的保护期限为()年。
作为一个发展中国家,自主创新并非自己创新,更非封闭式创新。不能排斥技术引进,但技术创新能力无法通过引进直接获得,关键技术更是买不来。日本和韩国引进技术和消化吸收费用的比例分别为1:5和1:8,而我国的比例为1:0.15。由此可见,我国技术引进的主要问题是
张某与王某是一对夫妻,二人共同育有一子小张。张某擅自将婚后购买的只以自己的名字登记的房屋卖给不知情的李某,李某认为价格合理,当场交付了一半房款,并约定所有权变更登记手续办妥后付清剩余款项。不久张某反悔要求解除合同,于是李某向法院起诉要求张某按照约定转移房屋
下面的心理学家提出的理论具有强化论思想的有()
最新回复
(
0
)