Of course, the earth's climate has always been changing due to “natural” factors such as volcanic eruption (熔化) or changes in solar, or cycles concerning the Earth's going around the sun. According to the scientific research, however, the warming observed by now matches the pattern of warming we would expect from a build-up of greenhouse gas in the atmosphere-not the warming we would expect from other possible causes.
Even if scientists did discover another reasonable explanation for the warming recorded so far, that would give birth to a difficult question. As Robert Henson puts it: “If some newly discovered factor is to blame for the climate change, then why aren't carbon dioxide and the other greenhouse gases producing the warming that basic physics tells us they should be?”
The only way to prove with 100% certainty that humans are responsible for global warming would be to run an experiment with two identical Earths-one with human influence and one without. That obviously isn't possible, and so most scientists are careful not to state human influence as an absolute certainty.
59.In most scientists' opinion, the global warming is mainly caused by________.
A. solar activity
B. volcanic activity
C. natural factors
D. human factors
60.The text is developed by________.
A.giving typical examples
【2017届广东省广州市天河区重点学校高考英语一轮复习检测:1(含答案)】相关文章:
★ 2017届广东省广州市天河区重点学校高考英语一轮复习检测:4(含答案)
★ 四川省2016届高考英语一轮复习课时作业(35) Module 5 Cloning 外研版选修6
★ 2017届广东省广州市天河区重点学校高考英语一轮复习检测:9(含答案)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:26(含解析)
★ 2017届高考英语二轮复习大题冲关秘籍短文改错:体验真题(含解析)
★ 2017届高考英语二轮复习书面表达限时测验:6(含解析)
★ 2017年高考英语二轮复习精品资料:专题15 完形填空(教学案)(原卷版)
★ 2017届广东省广州市天河区重点学校高考英语一轮复习检测:3(含答案)
★ 2017届江苏省淮安市新马中学高考牛津译林版英语一轮复习活动单:模块8 Unit 1《The written word》
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21