温室效应是怎么发生的呢？当太阳的光和热射到地球上时，有一部分会被地面、海洋和植物吸收，有一部分会反射回空中。温室气体就像一层玻璃，可以让反射的光和热不容易逃逸到太空，而是再次回到地球上。这样，地球就能保持一个平均约15摄氏度的温度，而不是零下18摄氏度。温室气体有哪些呢？最常见的是二氧化碳、甲烷...
How Warm Is the Earth? Study Suggests a 120,000-Year RecordThe Earth today is warmer than it's been in 120,000 years, andcould be poised to break a...Hoover, Amanda
They ___ ___ ___a warm welcome at the airport5.He has made several trips to Paris?(改为一般疑问句,作否定回答)___he ___several trips to Paris?___,___ ___ ___6.How pretty the little garden is!(改为同义句)___ ___ ___ little garden is!7.Jim ought to stay at home to...
D. What Wang Runxi foun d about Earth.( C )4. According to Wang, how has global warming affecte d ants in recent years? A. Many ants have move d to warm places. B. More ants start to live in forests. C. More ants are moving to the two poles. D. The number of ants is ...
The Earth becomes too warm.13.There's another gas causing climate change. No one talks about it as much. It is nitrous oxide(氧化亚氮). Many call it laughing gas. Dentists may give patients nitrous oxide so they will not feel pain. The atmosphere has small amounts of nitrous oxide. ...
Surface-area : volume ratio is 2:1If you imagine these are simple cubic warm-blooded animals, then the small cube has 3 times the surface area per unit of volume compared to the large cube.If each of these are both warmer than the outside temperature, the small cube will cool down muc...
knew about fire during this time.When living things enjoyed the warmth of the sun . they often wondered how to take fire from the sky to provide warmth when the snows came . They didn't know how touse fire to cook food or harden spears...
How Global Warming Works Gases in the Earth’’s atmosphere act like glass in a greenhouse-trapping heat and making life on Earth possible. But there is a delicate balance. Burning coal, oil and natural gas increases atmospheric concentrations of these gases. Over the past century, increases in...
Ⅲ.语篇填空There is no doubt that the earth is becoming 1.(warm)on average. But how has this come about and does it mat-ter? People have fierce debates about whether 2.. is human ac-tivity that has caused this global warming, 3.(com-pare)with most of the natural changes.Many ...
1How on earth (究竟) can people turn sunlight into 1. ___ (use)electricity? The 2. ___ (Sun) light (and all light) has energy.3. ___ (Usual), when light hits an object (物体), the energy turns into heat, like the 4. ___ (warm) you feel while sitting 5. ___ the sun...