题目内容：
Now a paper in Science argues that organic chemicals in the rock come mostly from __________ on earth rather than bacteria on Mars.
参考答案：
答案解析：
单选题：Now a paper in Science argues that organic chemicals in the
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In "What do you think he likes?" what is __________ of the s
In "What do you think he likes?" what is __________ of the sentence.
I hope that the little __________ I've been able to do has b
I hope that the little __________ I've been able to do has been of some use.
在计算机小采用二进制，是因为（ ）。
在计算机小采用二进制，是因为（ ）。
回答第42空。
回答第42空。
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