Therehasbeenlifeonearthfor___years.( ) A. million B. amillionof C. millionsof 相关知识点: 试题来源: 解析 C 答案:C 考查数词的用法.millions of+名词复数;one/two million 固定用法,所以选择C.地球上的生命已经有几百万年了.考查数词的用法,掌握固定用法是解题的关键.反馈 ...
根据"there has been life on the earth"可知,这里用的是现在完成时态,结合题目要用介词来填空,for+一段时间,since+时间点或者从句;hundreds of millions of years指的是一段时间,因此应用介词for。故填:for。【思路点拨】科学家们认为地球上的生命已经存在了数亿年。【解题思路】理解题干,结合语境,填写正确...
Passage One Animal life first appeared on the earth about 400 million years ago. Through the passing millennia, thousands of animal species have come and gone. Until recently, this process was gradual, the result of changes in climate, in habitat, or in the genes of the animals themselves. ...
( ) There has been life on Earth for years. A. millions B. millions of C. a millions of D. million 相关知识点: 试题来源: 解析 地球上有生命已经有几百万年了。 millions of 几百万的。 B.反馈 收藏
Evidence for life on Earth before 3800 million years ago. Mojzsis SJ,Arrhenius G,McKeegan KD,et al. Nature . 1996Mojzsis S. J., Arrhenius G., McKeegan K. D., Harrison T. M., Nutman A. P., and Friend C. R. L. (1996) Evidence for life on Earth before 3,800 million years...
Scientists think that there has been ___(life) on the earth for hundreds of millions of years.为什么课本用单数? 相关知识点: 试题来源: 解析 这里确实是应该用单数的. 对于这个句子来说,there has been……是there be 结构,这里用的是has,所以后面跟的一定是单数,所以用的是life的原型. 希望我的回答...
百度试题 结果1 题目11. There has been life on Earth for(million) of years. 相关知识点: 试题来源: 解析 11. There has been life on Earth for millions (million) of years. 反馈 收藏
考查therebe句型和时态。句意:在过去的5亿年里,地球上有五次生命几乎灭绝。根据句中时间状语In the last 500 million years可知,用现在完成时。表示“有”可用there be句型。“5次”翻译为 five times,为复数形式,谓语动词用have。故填have been five times。反馈...
In the last 500 million years, there have been five times 1 life on Earth has almost ended. Many 2 (scientist) say we are now entering the Earth’s sixth mass extinction. There is 3 long list of reasons why so many species 4 (die) out. This time, human activity will be 5 (blame...
百度试题 结果1 题目 (C)1. There has been life on earth for years. A. million B. two million of C. millions of D. two millions of 相关知识点: 试题来源: 解析 答案见上 反馈 收藏