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, a purely【B1】______ activity that would not have
A project likely to evolve in. the near or intermediate future is space tourism, a purely【B1】______ activity that would not have
admin
2010-06-11
20
问题
A project likely to evolve in. the near or intermediate future is space tourism, a purely【B1】______ activity that would not have to rely on unpredictable government decisions. It would 【B2】______ put space operations on a much more solid, dependable footing and would enormously【B3】______ man’s space activity. While some people see space tourism as a【B4】______ multibillion-dollar business, difficult technical problems remain to be【B5】______
First, a manned reusable rocket like the Venture Star must be built. Then, a second serious problem must be【B6】______ : even today’s most-advanced space rockets are able to【B7】______ only about 2.5% of their launch weight into orbit-- a ratio that has hardly changed in the last 40 years. This fact is a result of the【B8】______ of material characteristics and chemical power sources, and【B9】______ .
Today the price of a ticket to space would have to be at least $ 50 000. It is questionable【B10】______ . However, space tourism may become more attractive once space facilities are built【B11】______ .
【B9】
选项
答案
there is no indication that any fundamental breakthrough can be expected in these areas in the foreseeable future
解析
转载请注明原文地址:https://jikaoti.com/ti/QzMMFFFM
0
大学英语六级
相关试题推荐
Fromthepassage,whichisthemaininfluencefactorinthefuture?Theinfluencethatthereductionofyoungpeoplehashadon
Fromthepassage,whichisthemaininfluencefactorinthefuture?Fromthepassage,welearnpeoplewillhavetokeepworking
Onthewhole,ambitiousstudentsaremorelikelyto______(在学业上比没有抱负的学生更成功).
Badeatinghabits,increasedfoodavailability,increasinglysedentarylifestyleandreducedphysicalactivityarethefirstfou
Badeatinghabits,increasedfoodavailability,increasinglysedentarylifestyleandreducedphysicalactivityarethefirstfou
Badeatinghabits,increasedfoodavailability,increasinglysedentarylifestyleandreducedphysicalactivityarethefirstfou
Badeatinghabits,increasedfoodavailability,increasinglysedentarylifestyleandreducedphysicalactivityarethefirstfou
Badeatinghabits,increasedfoodavailability,increasinglysedentarylifestyleandreducedphysicalactivityarethefirstfou
随机试题
下列关于劳动争议仲裁时效的表述错误的是()
Thechildrenareas______aslarks.
下列案件中,导致立案管辖和审判管辖的主体重合的是:()
为社会提供检测或校准服务的实验室为()。
班级授课辅助的教学组织形式是()。
信念的特征表现在,它具有()
(16年)设矩阵,且方程组Aχ-β无解.(Ⅰ)求a的值;(Ⅱ)求方程组ATAχ=ATβ的通解.
操作数地址的16位偏移量(又称有效地址EA)直接包含在指令中,紧跟在操作码之后,存放在代码段区域的寻址方式是
Onthefirstdayofschooloneofmyclassmatesbeganatalkwithmethatchangedmylife.Shesaid,"Hi,handsome.MynameisR
ShouldWeEmbraceCyberspeak?1.越来越多的网络用语渗透到日常口语和书面语中2.有人认为这是语言发展的结果,也有人认为这是对语言的污染3.我的看法
最新回复
(
0
)