If penicillin had not been available, many people from sickness or even small wounds.A．would dieB．would have diedC．will have diedD．might die 题目和参考答案——青夏教育精英家教网—

题目内容

If penicillin had not been available, many people _____ from sickness or even small wounds.

A．would die	B．would have died
C．will have died	D．might die

解析试题分析：考查虚拟语气：if条件句用had done表示和过去的事实相反，主句用would have done表示虚拟，句意：如果没有青霉素，很多人就会死于疾病或小的伤口。选B。
考点：考查虚拟语气
点评：虚拟语气在条件句中的用法是：虚拟条件句与现在事实相反的假设，从句是If+主语+动词的过去式（动词be用were)，主句是：主语+should,would, might,could＋动词原形；与过去相反的假设从句用：If+主语+had +过去分词，主句是：主语＋should, would, might, could ＋have done；与将来相反的假设，从句用1、If+主语+动词过去式，主语＋should, would do，2、If+主语+were to+ 动词原形，加主句3、If+主语+should +动词原形，加上主句的might, could＋动词原形

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Scientists studying the impact of climate change on the Arctic need to consider ways to reduce their own carbon footprints(碳排放量), says Ryan Brook, a researcher who regularly flies north to study the health of caribous(驯鹿).He calls on scientists to show leadership by examining and sharing ways to reduce the impact of working in polar regions.

“The importance of the research is not at question here. It is important to our understanding of and adapting to climate change. But we need to think about better approaches,” says Brook.

“This is an issue for all scientists, though polar researchers often travel particularly long distances using commercial air travel. We also rely extensively on small aircraft, icebreakers, and snowmobiles, all of which produce large amounts of carbon.”

Brook studies the health of caribou herds in Nunavut and Northwest Territories. He works with northern wildlife managers. This work typically takes him north five or six times per year and when he calculated his own carbon footprint, he was not happy with the result.

“My research footprints are about the same as the annual footprints of an average Toronto resident. Basically, I have two footprints — my own personal life, which is moderate, and my research footprint.”

Climate scientists can rightly argue that Arctic research is a specialized field and the community of scientists who travel north is relatively small. Even if all scientists working in the north reduced their carbon emissions, it would not make a big impact on the global scale. For Brook, it’s the option that matters.

There are ways researchers can reduce the amount of carbon they use. Some helicopters use less fuel than others. Solar and wind power are alternatives to gas-fired generators. And while carbon offsets(抵消) don’t reduce the amount of carbon emitted, they are an easy first step.

“There aren’t necessarily any easy answers, but we need to start talking about it,” says Brook. “This is particularly important for the next generation of scientists being trained and I hope to see them become leaders in this issue.”

What did Brook find when he calculated his own carbon footprints?

A. His carbon footprints are more than the annual footprints of a Toronto resident.

B. His personal life footprints are more than the annual footprints of a Toronto resident.

C. His research footprints are about the same as his personal life footprints.

D. His personal life footprints are more than his research footprints.

Brook’s opinion is challenged by the statement that .

A. arctic research is very important

B. the Arctic is a special environment

C. the footprints of Arctic scientists are small

D. Brook’s situation is a common phenomenon

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A. we should take actions immediately instead of just talking

B. it’s easy to start talking about the problem of carbon emissions

C. it’s necessary now to pay attention to the problem of research footprints

D. the next generation of scientists are more interested in research footprints

What’s the main idea of the text?

A. The importance of arctic research is not at question.

B. Climate change becomes worse because of arctic research.

C. Brook suggests ways of reducing the use of carbon.

D. Scientists must look at their own carbon footprints.

根据所提供的语境，从方框中选择适当短语的正确形式填空，使句子完整。（其中有两个多余词）

refer to, be supposed to , be back on one’s feet, lack of, inform… of, speed up, make any difference, a variety of, put one’s hands on, break down,

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