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
2024-11-16
24
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] 【S3】
选项
答案
If-While/Although
解析
连词误用。此处前半句指出“一些人把太空旅行看作一个非常具有赢利潜力的商业”,后半句指出“技术难题仍有待解决”,可见二者不是条件关系,而是转折关系,因此使用While或Although比较合适。
转载请注明原文地址:https://tihaiku.com/zcyy/3848002.html
相关试题推荐
Aprojectlikelytoevolveinthenearorintermediatefutureisspacetouri
Aprojectlikelytoevolveinthenearorintermediatefutureisspacetouri
Aprojectlikelytoevolveinthenearorintermediatefutureisspacetouri
PASSAGETHREE[br]Howdoyousummarizethedescriptionoffuture-mindednessin
Youngpeoplearefacinganuncertainfuture.Asthe21stcenturydawned,the
Youngpeoplearefacinganuncertainfuture.Asthe21stcenturydawned,the
Youngpeoplearefacinganuncertainfuture.Asthe21stcenturydawned,the
Youngpeoplearefacinganuncertainfuture.Asthe21stcenturydawned,the
Youngpeoplearefacinganuncertainfuture.Asthe21stcenturydawned,the
Youngpeoplearefacinganuncertainfuture.Asthe21stcenturydawned,the
随机试题
无论多忙,你都应该抽时间看望父母。Nomatterhowbusyyouare,youshouldspendsometimevisiting
A.enhanceB.equivalentC.idealD.probablyE.muc
Wheredoestheconversationtakeplace?[br][originaltext]W:Thisfoodisterr
Chinaisatime-honoredmulti-ethnicsnationwithavastterritoryandabund
患者,男,12岁,4个第一磨牙远中关系,前牙Ⅲ。深覆,Ⅱ。深覆盖,下切牙咬在上牙
拥抱阳光 ①他是个平凡的男孩,生在一个偏僻的小山村,父母都是老实巴交的农民,学
A.半夏B.紫菀C.桔梗D.苦杏仁E.柴胡作用于外周神经末梢而止咳药物是
丽丽的丈夫经常因为琐事对她破口大骂,最后发展到动手打她,丽丽向所在地的社会工作者
元认知是(),即对认知过程的知识和观念与对认知行为的调节与控制。
法律主体一定是会计主体,但会计主体不一定是法律主体。()
最新回复
(
0
)