They also helped build the vast network of railroads that__________important trade centers essential to industrial grenth。

A．had linked

B．link

C．linking

D．linked

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答案解析

首先可判断出此句是关系代词that引导的定语从句。先行词是network of railroads，从句中缺少谓语动词，故可排除C。根据主句的时态，应用一般过去时，故选D。

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1 Thus, in the American economic system it is the demand of individual (A) consumers, coupled with (B) the desire of businessmen to maximize profits (C) and the desire of individuals to maximize their incomes, which (D) together determine what shall be produced and how resources are used to produce it。

A．individual

B．coupled with

C．maximize profits

D．which

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2 Questionsrefer to the following article。
President Barack Obama has issued his call to put global warming at the top of the international agenda, pledging to push for coordinated action by the world's biggest countries to tackle the problem of climate change。
In the speech, the US president on Tuesday laid out a three-part plan to deal with climate change using the power of his office。
He outlined a strategy to cut the US's carbon pollution by reducing emissions from coal-fired power plants; to prepare the US for the impact of climate change, such as the super storm that ravaged the New Jersey coastline last year, and to lead the world by example in combating changing climate。
"While no single step can reverse the effects of climate change, the president believes we have a moral obligation to our kids to leave them a planet that's not polluted and damaged," a White House official said。
The coal industry said the proposals could prove devastating--hares in US coal mining companies have been falling sharply--but Mr.Obama's speech was being watched closely around the world。
In Europe, where the Eurozone crisis has pushed the climate change agenda firmly into the political background, environmental campaigners said they hoped Mr.Obama's speech would puncture arguments tackling global warming as bad for the economy."If you have got the US and China moving, then the argument that the EU is going it alone clearly doesn't stand up to scrutiny anymore," said Tom Brookes of the European Climate Foundation。
The president said he would seek to expand new and existing international initiatives,including bilateral initiatives with China, India and other big emissions countries。
What was the main point of Obama's speech?

A．to call for actions to tackle the problems of climate change

B．to co-ordinate for the implementation of international agenda

C．to lay out a plan for environmental problems

D．to find reasons for recent global warming

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3 Which of the following is NOT included in the US president' s strategy?

A．to set a good example for the world

B．to fight against the super storm in the New Jersey

C．To cut emissions from coal-fired power plants

D．to prepare the US for the influence of the changing climate

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