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【单选题】
According to the passage, scientists have concluded which of the following from the discovery of the large amount of deuterium found in comets?A.
Comets do not contain enough deuterium to have solely created the Earth's oceans.
B.
Given the ratio of deuterium to ordinary hydrogen in seawater, comets cannot have contributed to the Earth's oceans.
C.
It is likely that comets contain less Xenon than meteorites do.
D.
Given the low level of deuterium in the waters of Earth's oceans, comets cannot be its sole source.
E.
Comets now play a greater role in the creation of the Earth's oceans than was previously thought.
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反馈参考答案：
举一反三
【简答题】Revit中支持线型图案的设置,那么下面哪种不是在Revit环境中创建的
【单选题】糖尿病重要的代谢变化之一是 . prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
肌糖原合成增加
B.
肌肉蛋白分解增加
C.
肝糖原分解增加
D.
肝合成胆固醇减少
【单选题】护理是一门专门职业的观点始于:
A.
以清洁卫生为中心的阶段
B.
以疾病为中心的阶段
C.
以患者为中心的阶段
D.
以人的健康为中心的阶段
E.
以人的生命为中心的阶段
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