People try to avoid public transportation delays by using their own cars, and this
________creates further problems.(2007· 湖北)
A．in short B．in case C．in doubt D．in turn
仁爱英语同步练习册系列答案
学习实践园地系列答案科目：高中英语 来源：外研版选修7同步训练：综合仿真测试1-6英语试卷（解析版） 题型：阅读理解
With petroleum reserves (石油储量) decreasing，the search is on to replace gas with a cleaner，greener alternative.Though much eco－talk has centered on biofuels from corn and soybeans，the biofuel that looks more likely to replace petroleum comes from a most unlikely source：algae (藻类)．
Algae，like corn，soybeans，and other crops，grow via photosynthesis (光合作用) and can be processed into fuel oil.However，they yield 30 times more energy than land crops such as soybeans，according to the U．S.Department of Energy.Many algae species also can grow in saltwater and polluted water－while corn and soy require arable land and fresh water that will be in short supply as the world's population balloons.
“If you replaced all the diesel (柴油) in the U．S.with soy biodiesel，it would take half the land mass of the U．S.to grow those soybeans，”says Matt Caspari，chief executive of Aurora Biofuels，a Berkeley，Calif.－based private firm that specializes in algae oil technology.On the other hand，the Energy Department says that if algae fuel replaced all the petroleum fuel in the United States，it would require 15,000 square miles，which is a few thousand miles larger that Maryland (12,407 square miles)，the 42nd state in land area.
Another bonus：Because algae can be grown just about anywhere in a closed space，they 're being tested at several power plants across the nation as a carbon absorber.Smokestack emissions (烟囱排放物) can be pumped directly into the ponds，feeding the algae while keeping greenhouse gases out of the atmosphere.
Although processing technology for algae fuel—also known as “oilgae” in some environmentalist circles—is improving，it's still years away from reaching your local gas pump.“It's just a question of cost，because no large－scale facilities have been built yet，” Caspari says.
1.The underlined word “yield” in Paragraph 2 can be replaced by “________”．
A．control B．require
C．produce D．grow
2.Compared with corn and soybeans，algae ________.
A．may pollute water and soil
B．can grow in poor conditions
C．provide much less energy
D．need more special care
3.According to Paragraph 3，one of the advantages of algae fuel is that ________.
A．it can be used more widely
B．it is more easy to produce
C．it needs much less land
D．it costs much less money
4.What do we learn about algae from Paragraph 4?
A．Algae help protect the environment.
B．People can grow algae anywhere.
C．Fish can get more oxygen from algae.
D．Algae produce less waste.
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科目：高中英语 来源：外研版选修7同步训练：Module 6（18）英语试卷（解析版） 题型：单项填空
Can you imagine that a smart man like him ________ make such a stupid mistake?
A．might B．should C．would D．need
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科目：高中英语 来源：外研版选修7同步训练：Module 6（17）英语试卷（解析版） 题型：单项填空
My parents don't mind what job I do ________ I am happy.
A．even though B．as soon as
C．as long as D．as though
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科目：高中英语 来源：外研版选修7同步训练：Module 6（17）英语试卷（解析版） 题型：单项填空
But for the help of my English teacher, I ________ the first prize in the English Writing Competition.
A．would not win B．would not have won
C．would win D．would have won
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科目：高中英语 来源：外研版选修7同步训练：Module 6（16）英语试卷（解析版） 题型：单项填空
．Our teacher is very busy.He is ________ in working out a teaching plan.
A．involve B．involving
C．involved D．to involve
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科目：高中英语 来源：外研版选修7同步训练：Module 6（16）英语试卷（解析版） 题型：单项填空
The city ________ 6 billion yuan to preserve the character of the old town, mainly
to divert water from the Taihu Lake and the Yangtze River to supply the waterway systems of the old town.
A．invested B．proved C．invaded D．invented
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科目：高中英语 来源：外研版选修7同步训练：Module 5（4）英语试卷（解析版） 题型：单项填空
He once observed that “All happy families ________ one another, but each unhappy family is unhappy in its own way”．(2012·桂林十八校联考)
A．like B．appear C．resemble D．represent
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科目：高中英语 来源：外研版选修7同步训练：Module 4（12）英语试卷（解析版） 题型：单项填空
—You should have thanked the hostess before leaving.
—I meant ________.But I couldn't find her when I was leaving.
A．to do B．to C．doing D．doing so
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