首页
登录
职称英语
The main reason we explore Mars is to determine if life ever existed on the
The main reason we explore Mars is to determine if life ever existed on the
游客
2023-09-01
28
管理
问题
The main reason we explore Mars is to determine if life ever existed on the planet. We have tried for centuries, starting with 【B1】______and lately with satellites, landers and rovers. We have 【B2】______ for it directly and indirectly. No luck so far. Some think life has never been there. Others think it was there in the past but is now gone. Many think why bother, but that’s a whole different story. I think we are 【B3】______in the wrong places. Here is why.
The surface of Mars is 【B4】______cold and dry. Cosmic and solar 【B5】______reach the surface by the thin atmosphere, and the soil contains strong oxidants (氧化剂) that destroy organic 【B6】______. Fat chance for life. But it wasn’t always so.
Early in its history Mars was warmer and 【B7】______enough for the development of rivers, lakes and perhaps oceans. The atmosphere was thicker and the protective magnetic (磁的) field was switched on. Mars might be 【B8】______today, but life would have been possible in the past. 【B9】______
But first we need to find a promising location, and that means reconstructing Martian history. 【B10】______, what type of minerals formed and if the geochemical conditions were compatible with life. Once promising sites are identified, we need to find out if there are 【B11】______ [br] 【B11】
选项
答案
any physical or chemical processes that could havedestroyed fossilised evidence,and finally search for that evidence
解析
听写关键词physical,chemical,processes,destroyed,fossilised evidence,search for,evidence
转载请注明原文地址:https://tihaiku.com/zcyy/2975613.html
相关试题推荐
Everyonceinawhilethereasonsfordiscouragementaboutthehumanprospec
【S1】[br]【S4】A、determinedB、decidedC、proposedD、doubtedBSoOfcom...hasdecide
[originaltext](26)Oneofthereasonsforoursuccessasaspeciesisour
[originaltext](26)Oneofthereasonsforoursuccessasaspeciesisour
[originaltext](26)Oneofthereasonsforoursuccessasaspeciesisour
[originaltext]Oneofthereasonsforoursuccessasaspeciesisourabilityto
[originaltext]Oneofthereasonsforoursuccessasaspeciesisourabilityto
[originaltext]Facialexpressionscarrymeaningthatisdeterminedbysituat
[originaltext]Facialexpressionscarrymeaningthatisdeterminedbysituat
OnereasonwhyReebok’smanagerialpersonneldon’tliketheirshoestobecalled
随机试题
Weweregladtolearnfromyourletterof18thJulyofyourinterestinourprod
FindingtheRightHome—andContentment,TooA)Whenyourelderly
Labelthediagrambelow.ChooseNOMORETHANTHREEWORDSAND/ORANUMBERfromth
依赖cAMP的蛋白激酶是()。A.受体型TPK B.PKC C.非受体型
某企业打算继续使用旧机器,该机器是5年前以60000元购入的,残值率为10%,预
2015年中国电子商务市场交易规模16.4万亿元,增长22.7%。其中网络购物增
如图1,该绘画作品的作者是()。 A.吴昌硕 B.林风眠 C.关山月
以可见光波的长短为序,人类感觉到的颜色依次为A.紫红黄蓝 B.紫蓝青绿 C.
如果受测者样本具有代表性,对于中等难度的测验,其测验总分的分布应该接近()。单
钢结构焊缝质量等级分为( )A.特级 B.一级 C.二级 D.三级 E
最新回复
(
0
)