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题型:语法填空-短文语填 难度:0.65 引用次数:79 题号:21045774
阅读下面材料, 在空白处填入1个适当的单词或括号内单词的正确形式。

The Perseverance Rover on Mars continues to perform amazing feats of science. Most recently, an instrument on the Perseverance     1     (turn) carbon dioxide into oxygen, a process that could one day help astronauts breathe on the red planet.

96%of the Martian atmosphere is carbon dioxide, which doesn’t do much for humans who need oxygen     2     (breathe). Scientists say it is a critical first step in     3     (change) carbon dioxide into oxygen on Mars. The experimental instrument aboard Perseverance     4     (know)as MOXIE.

“MOXIE has more work to do. It is helping us move toward our goal of one day seeing humans on Mars, ”scientists say. “Oxygen serves a much     5     (great) purpose than just being the air we breathe. The rocket propellant (推进剂) depends     6     (heavy) on oxygen,     7     future explorers will depend on producing propellants on Mars to make the trip home. Whether for rockets     8     astronauts, oxygen is the key. ”

MOXIE works     9     separating oxygen atoms from carbon dioxide molecules, which are made up of one carbon atom and two oxygen atoms. A waste product, carbon monoxide, is emitted into the Martian atmosphere. Much larger and better     10     (version) of MOXIE could be used to turn huge quantities of carbon dioxide into oxygen.

【知识点】 天体和宇宙 航空航天

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