题目内容
—Where is the post office?
—It's just over there, at the end of the street. You not miss it.
A．can B．must C．may D．would
A
【解析】
试题分析：句意：--邮局在哪里？--就在那边，在街的尽头，你不可能错过它。can能； must必须； may 可以； would将。根据句意故选A。
考点：考查情态动词的用法。
点评：本题难度适中。情态动词是高中阶段的重难点之一，需要考生熟记它们的用法，在各类考试中经常出现，情态动词的完成式主要用于表示对过去情况进行推测或责备也是高考常考的内容。
即学即练：I know things are hard with you, but you ____try to get over the difficulties.
A. can B.may C. must D. ought
解析C。句意：我知道事情对你来说很困难，但是你必须试图克服这些困难。
gone D. deadIt’s true that quite a few most respected scientific authorities have confirmed that the world is becoming 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 activity | B．volcanic activity |
| C．natural factors | D．human factors |
| A．giving typical examples |
| B．following the order of space |
| C．analyzing a theory and arguing it |
| D．comparing and finding differences |
| A．totally different | B．exactly the same |
| C．extremely important | D．partly independent |
| A．volcanic eruption |
| B．cycles concerning the Earth’s going around the sun |
| C．changes in solar |
| D．floods and droughts |
| 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? |