Life on earth began 300m years earlyLife on Earth began almost four billion years ago - 300 million years sooner than was previously thought, and only 200 million years after the Earth was sterilised by meteorite bombardments, according to new studies of ancient sedimentary rocks on Greenland....
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...
However, the idea that there is an especially intense “Late Heavy Bombardment”between about 4 and 3.8 billion years ago, whichobliterates any life,no longer seems to be true. This means life may have begun in the first few hundred million years of Earth’s existence. 4.4 billion years ag...
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 ...
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. ...
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...
根据“However, we haven’t found life on other planets yet.”可知,我们还没有在其他行星上发现生命,所以此处表示“有”,可用there be句型表示,故填there。【小题2】句意:科学家们认为地球上已经有生命几百万年了。此处构成“millions of”短语,意为“数百万”,故填millions。【小题3】句意:地球是一颗...
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
【题目】阅读理解Animal life first appeared on the earth about 400 million years ago. T hrough the passing millennia, thousands of animal species have come and gone. Until recently, this processwas gradual, the result of changes in climate,in habitat, or in the genes of the animals ...
Scientists think that there has been life on Earth for ___ years. A. millions B. millions of C. million of D. million扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报 B 解析看不懂?免费查看同类题视频解析查看解答 特别推荐...