It’s true that quite a few most respected scientific authorities have confirmed that the w

It’s true that quite a few most respected scientific authorities have confirmed that the world is being hotter and hotter. There’s also strong evidence that humans are contributing to the warming. Countless recent reports have proved the same thing. For instance, a 2010 summary about the climate science by the Royal Society noted that: “The global warming over the last half-century has been caused mainly by human activity.”
You may not believe that humans could change the planet’s climate, but the basic science is well understood. Each year, billions of tons of greenhouse gases are released into the atmosphere because of human activity. As has been known for years, these gases hold heat that would otherwise escape to space, wrapping the planet in an invisible (看不见的) blanket.
Of course, the earth’s climate has always been changing due to “natural” factors such as volcanic eruption 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.
【小题1】In most scientists’ opinion, the global warming is mainly caused by     .A．solar activityB．volcanic activityC．natural factorsD．human factors【小题2】The text is developed by     .A．giving typical examplesB．following the order of spaceC．analyzing a theory and arguing itD．paring and finding differences【小题3】The underline word “identical” in the last paragraph probably means     .A．totally differentB．exactly the sameC．extremely importantD．partly independent【小题4】Which of the following is not the cause of climate change?A．volcanic eruptionB．cycles concerning the Earth’s going around the sunC．changes in solarD．floods and droughts【小题5】Which of the following can be the best title?A．Are All the Scientists Really Scientific?B．Where Is Global Warming Leading Us to?C．Are Humans Definitely Causing Global Warming?D．What’s the Relation of Global Warming and Greenhouse Gases?D