6.HOW LIFE BEGAN ON THE EARTH No one knows exactly how the earth began,as it happened so long ago.However,according to a (76)widelyaccepted theory,the universe began with a"Big Bang"that threw matter in all (77)
Life began in the ocean(海洋). They are home to about two million species(物种), from the largest animal that has ever lived on the Earth to the smallest one. New species are found all the time, as scientists say that 91%of ocean species have yet to be found or described. ...
Conditions on Early Earth If you took a trip back in time to when the Earth was forming about 4.6 billion years ago, you'd find a very different planet than the one we know and love today. The Earth likely began as a mass of hot, molten material that was constantly being bombarded by...
(一)(2021 ·全国新高考I卷)My life as a tax-paying employe d person began in middle school, when, for three whole days, I worke d in a baking factory.My best frien d Betsy's father was a manager at Hough Bakeries, which, at Easter time, __1_ little bunny(兔子) cakes for all ...
swoon. As We worked on; but the water increasing in the hold, it was apparent that the ship would founder; and though the storm began to abate a little, yet it was not possible she could swim till we might run into any port; so the master continued firing guns for help; and a ...
are the symbols printed beneath the Chinese characters on road signs and shop fronts (Starbucks included).They are Dongba pictographs, 2 ancient form of script(文字)that originated among the Naxi,a local ethnic group.It almost 3 (die) until about a decade ago, 4 local officials began to ...
Few traces of Earth’s geologic record are preserved from the time of life’s emergence, over 3,800 million years ago. Consequently, what little we understand about abiogenesis — the origin of life on Earth — is based primarily on laboratory experiment
It is a word usually used to talk about certain animals such as birds, fish and so on. When animals migrate, they travel a long way from one part of the world to another according to the season. For example, swallows (燕子) migrate south in winter. Many animals migrate—they do this...
课时分层作业(六)Ⅰ.阅读理解 A Many people criticisetoday's newspapers as sensationalist, satisfyingthe public's abnormal curiosity.Butjournalism a century ago was justas notorious(臭名昭著)．Publishers atthattime routinely competed with each other for wild storiesthatcould draw inthe mostreaders....
The Hadean era began as the Earth rapidly cooled following the collision with the putative planet Theia. This early atmosphere was rapidly eroded by the solar wind (Lammer et al. 2014; Massol et al. 2016). Cooling thereafter would have been rapid and Zahnle et al. (2007) estimate that it...