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. ...
【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 ...
a Ever since man appeared on the earth, man's survival has been heavily relied on nature. Almost everything we use in our everyday life comes from nature, ranging from the food we eat, the water we drink, to the wood which is turned into furiture. With the development of technology ...
Female Student: So, you mean, that's it. There's no way we can tell when life first appeared on earth. Professor: Well, there might be, let's think about this a minute.If no earlier rocks on earth could have survived with their fossil records intact.Is there anywhere else we could...
Recently, a debate concerning whether we should recycle our textbooks or not has appeared in our school. As far as I am concerned, we ought to recycle textbooks as a way of protecting environment. For one thing, recycling textbooks can not only save natural resources such as wood, but also...
Similarities between terrestrial planets at the time life appeared on EarthVenus, Earth, and Mars differ in size, distance from the Sun, atmospheric composition, and ambient conditions. However, during the first 500 Ma after their formation—approximately 4.56 Ga ago—they probably had comparable ...
A.the human body has changed compared with human first appeared on earth B.the way we live has changed a little C.our body can’t deal with the changes in life style D.the way we live today is proper for the human body 3.What is the main cause mentioned in the article why people...
Just then,Cait?s father appeared and explained Doug was sleepwalking. Not all sleep is the same every night. We experience some deep,quiet sleep and some active sleep,which is when dreams happen. You might think sleepwalking would happen during active sleep,but a person isn?t physically ...
But flowers appeared on earth millions of years before man, 他们的变化,也不是为了吸引人类的眼睛 而是为了吸引昆虫的眼睛 and they developed not to appeal to the human eye but to the eyes of insects. 这些设计不是随心所欲的 These designs are far from arbitrary. 这是一些能够表明 哪里能...
Clifford, the Big Red Dog, first appeared 50 years ago, along with Emily Elizabeth, the little girl who loves him. Today we have Norman Bridwell, to talk with NPR's reporter on his dog's 50th birthday. So, Norman, tell us how it all started. Well, it was 1962 and I was struggling...