百度试题 结果1 题目3. To find out, scientists need to know___(know) if Mars ever had water. 相关知识点: 试题来源: 解析 答案见上to know 此处考查“need to do sth.”,表示需要做某事。 反馈 收藏
Researcher Sparks New Debate with Findings Showing Little, If Any, Present-Day Water on MarsNorthern Arizona University
Mars, with a global ocean up to 120m provided solely by this source. Tharsis is large enough that its formation may have caused Mars to tilt over to one side and changed the location of the poles in the process. Massive impacts could have delivered additional water of their own, and ...
If Earth, Venus(金星)and Mars(火星)all started out with water on their surfaces, why don't Venus and Mars still have liquid water on their surfaces? Earth, Venus and Mars probably all began with similar amounts of water. Mars still has some of its water--but it's frozen underground....
Life on Mars has had 4+ billion years to bud. It does not seem to have accomplished very much budding in that time. At this point the most likely place where there might be some struggling buds is a polar lake 1 mile underground. ...
no air or water, we will not survive there. A. will have B. would have C. has D. is having C 【解析】句意:如果火星没有空气和水,我们将在那里无法生存。If引导的是条件状语从句,不能用一般将来时,而用一般现在时来代替。这里符合主将从现的原则,Mars是第三人称单数,所以用has,故选C。
If Mars no air or water, we will not survive there. A. will have B. would have C. has D. is having 相关知识点: 试题来源: 解析 C 【详解】 句意:如果火星没有空气和水,我们将在那里无法生存。 If 引导的是条件状语从句,不能用一般将来时,而用一般现在时来代替。这里符合主将从现的...
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D If humans ever settle on Mars, they will need water.There is just one problem-there seems to be only huge sheets of ice. Luckily, we know how to drill ice for water.Such methods are already used in Antarctica, and researchers now think they could get them to work on the Red ...
the type of lubricant required to keep everything from burning up. It's hard enough to do this on Earth, where you can use water based muds or high-pressure air to cool the bit and recover the cuttings. On a place like Mars, where air and water are almost non-existent, the difficult...