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. attempt B. charged C. crucial D. delicate E. essentially F. eventually G. expended H. fraction I. individual J. maintain
A. attempt B. charged C. crucial D. delicate E. essentially F. eventually G. expended H. fraction I. individual J. maintain
admin
2020-11-21
32
问题
A. attempt B. charged C. crucial D. delicate E. essentially
F. eventually G. expended H. fraction I. individual J. maintain
K. minority L. negligible M. scrapping N. slashing O. upsurging
Space X launched a cheaper, partially-used rocket into orbit. That’s a stride toward 【C1】______the price tag of sending payload to space. Successfully flying reusable rockets is a 【C2】______step toward the dream of sending people to Mars. Until now, rockets have almost all been single-use. Once the fuel is【C3】______, a rocket stage plummets to Earth, resulting in the destruction of extremely expensive equipment that costs tens of millions of dollars to build.
Its founder has likened that to 【C4】______a 747 jet after one flight, which would make air travel impossibly expensive. He has suggested that rocket launches could 【C5】______be much cheaper since the cost of the rocket propellants are less than 1 percent of the full-price ticket for a launch. So, if a rocket could be simply refueled like a jetliner for another flight, the cost of space travel could drop to a 【C6】______of what it is now. The stresses of spaceflight on reused boosters, however, are much greater than those on jetliners. The economics will depend on how many times a booster can be flown, and how much the 【C7】______expense will be to repair the booster each time.
Reusable spaceships are not a new idea. NASA’s space shuttles were the first real 【C8】______at a reusable spaceship, but the shuttles proved more 【C9】______than hoped, requiring an army of technicians to 【C10】______them between flights. As a result, they ended up being more expensive than expendable rockets.
【C2】
选项
答案
C
解析
空格前为不定冠词a,空格后为名词step,因此,空格处应填入一个形容词作定语修饰step。空格后提到,将人类送上火星是一个梦想,因此,能够成功地发射可重复使用的火箭是朝着这个梦想迈出的关键一步,故C项crucial“至关重要的,关键性的”为答案。
转载请注明原文地址:https://kaotiyun.com/show/TACK777K
0
专业英语四级
相关试题推荐
TreesTreesaretheoldestlivingorganismsonearth./Thegreatageoftreesmakesthemusefulforallsortsofscientific
MakingandWritingWordsI.AbriefintroductionA.Makingwordsisconceptuallyanengagingandeffectiveinstructionaltask.
Americans’PersonalityAmericansusuallyconsiderthemselvesafriendlypeople./Theirfriendships,however,tendtobeshor
A.additionalB.ideallyC.alteredD.personalE.likelyF.excessiveG.virtuallyH.combinedI.exceedJ.errorsK.p
(1)Afast-foodrestaurantwithinabout500feetofaschoolmayleadtoatleasta5percentincreaseintheoverweightrateat
ThreeTipstoImproveYourPublicSpeakingSkills1.Childrenasyoungas【T1】______:showandtellNumberonefear:【T2】_____
MostChinesepeoplewenttoworkbybikewithinliving_____.(2012-72)
[A]excessive[I]minimum[B]coexisted[J]plausibly[C]manipulation[K]subsidy[D]inaugurate[L]intervenes[E]emergenc
[A]excessive[I]minimum[B]coexisted[J]plausibly[C]manipulation[K]subsidy[D]inaugurate[L]intervenes[E]emergenc
A、Signtheleaseforaverylongperiod.B、Payonemonth’srentdepositinadvance.C、Renttheroomforatleast6months.D、Pay
随机试题
食物的归经理论,应用较多的是与“_______”的关系。
阅读陆游《关山月》一诗:和戎诏下十五年,将军不战空临边。朱门沉沉按歌舞,厩马肥死弓断弦。戌楼刁斗催落月,三十从军今白发。笛里谁知壮士心?沙头空照征人骨。中原干戈古亦闻,岂有逆胡传子孙?遗民忍死望恢复,几处今宵垂泪痕!请回答:说明“今宵”“
没有临床症状但能不断排出病原体,在感染性疾病中成为重要的感染源的是
如果F=250kN/m,则基底净反力的最大值与下列( )值接近。如果基底设混凝土垫层,取保护层50mm,按《混凝土结构设计规范》,取βh=0,则基础在I-I截面的抗剪承载力与下列( )项值接近。
2016年1月初,甲公司将闲置厂房出租给乙公司,合同约定每月租金2000元,租期未定。签订合同时,预收租金8000元,双方已按定额贴花。9月底合同解除,甲公司收到乙公司补交租金10000元。甲公司9月份应补缴印花税()元。
下列农业谚语说法正确的是()。
马克思主义的本质属性有()
AAngryabouttheNewLawsBTheDangerousElderlyDriversCBeatingthe1stJulyDeadlineDNewLawsforYoungCaliforniaD
Onlywhenyouhaveacquiredagoodknowledgeofgrammarandvocabulary_________fluently.
A、Themandoesn’tliketotakethewomantotheparty.B、Thewomanishisfirstchoice.C、Themanwouldliketotakeanywomant
最新回复
(
0
)