首页
登录
职称英语
Perhaps more than anything else, scientists are eager to find out if Martian
Perhaps more than anything else, scientists are eager to find out if Martian
游客
2024-01-15
31
管理
问题
Perhaps more than anything else, scientists are eager to find out if Martian life existed in the past—or still exists.【C1】______telescopes first zoomed【C2】______Mars in the 17th century, people have conjured up a wild【C3】______of images or what Martians might look like. But space probes like the 1997 Sojourner land rover have yielded no evidence of such alien beings.
Most experts agree that if life did at one time evolve on Mars, finding evidence of that life— which would likely take the form of tiny organisms—won’ t be easy.【C4】______, many scientists are optimistic. " We’ ve got organisms on Earth that adapted to life deep【C5】______the surface in underground water wells, "says Stephen Clifford.【C6】______life like that evolved on Mars four billion years ago, there’ s no reason why it【C7】______today. "
【C8】______last year’ s disappointing losses, the future of Martian exploration looks【C9】______This year, two major films about fictitious Mars missions—Red Planet and Missions to Mars—are certain to heighten interest in our planetary neighbour. More important, plans for new sets of NASA orbiters and landers—one to launch in 2001 , the other in 2003—are already in the works. Without a doubt, each new mission will inch scientists closer to【C10】______the mysteries of planet Mars. [br] 【C6】
选项
A、When
B、What
C、That
D、If
答案
D
解析
本题考查从句的引导词。when表示“当……之时”;what表示“什么”。that引导从句,没有实际意思。if表示“如果”,引导条件状语从句。根据句意,本题选D。
转载请注明原文地址:https://tihaiku.com/zcyy/3363192.html
相关试题推荐
______theuniversecouldneverdiewasoncebelievedbyscientists.A、ForB、WhyC
______anythingabouttheaccident,hewenttoworkaswell.A、NotknowB、Knownot
Concerningmoneyoranythingelse,conflictsbetweenhusbandandwifeusuall
Concerningmoneyoranythingelse,conflictsbetweenhusbandandwifeusuall
Nooneknowshowmanlearnedtomakewords.Perhapshebeganbymakingsound
Nooneknowshowmanlearnedtomakewords.Perhapshebeganbymakingsound
Nooneknowshowmanlearnedtomakewords.Perhapshebeganbymakingsound
Nooneknowshowmanlearnedtomakewords.Perhapshebeganbymakingsound
Scientistscanpredictregions______newspeciesaremostlikelytobefound.A、wh
Concerningmoneyoranythingelse,conflictsbetweenhusbandandwifeusuall
随机试题
Writeanessayofbetween180and200wordsinwhichyoudiscussthemoralo
[originaltext]RemnantsofRussia’sMirspacestationplungedintothePacifi
男性患者,30岁,病程4个月,头痛发病,入院前出现左侧肢体无力和呕吐,入院检
伴发甲亢危象时首先给予:A.大剂量碘剂 B.控制感染 C.抗甲状腺药物
胶类、蜜膏类入煎剂宜A.先煎B.包煎C.另煎D.后下E.烊化
A.阿托品 B.硝酸甘油 C.呋塞米 D.双嘧达莫 E.吗啡缓解急性心肌
内源性感染是指()。A.饮食不当引起的感染 B.通过医疗器械引起的感染 C.
特种作业的范围有()。A.电工作业 B.锅炉司炉 C.压力容器操作 D.
肺胀的病理因素,主要责之于A.心肾阳虚,水气凌心 B.肺肾两虚,气失摄纳 C
心力衰竭合并肾衰竭患者利尿药物首选( )。A.阿米洛利 B.氨苯蝶啶 C.
最新回复
(
0
)