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It's the first sign of progress after three years of confrontation, the statement of principles that would rid the Korean Peninsula of nuclear weapons. The North said it would abandon its nuclear programs in return for aid, economic cooperation and security guarantees. The chief American negotiator Christopher Hill described it as "a win-win situation" and "a good agreement for every one". The most contentious disputes between North Korea and Washington have all been deferred for future discussions. North Korea continues to insist on the provision of a civilian nuclear power plant to replace its existing facilities. The demand had nearly led to the breakdown of the talks.
The main idea of the news is ______.

A. North Korea agreed to hold peace talks with South Korea
B. North Korea violated the Nuclear Non-Proliferation Treaty
C. North Korea signed an agreement to abandon its nuclear weapons
D. North Korea abandoned its use of nuclear power

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What is one reason astronomers make long-time exposures？

A. To spend less time at their telescopes.
B. To overcome the problem of weak light.
C. To take more photographs.
D. To photograph astronomical objects without using a telescope.

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听力原文： Brazilian officials arrive in London today to meet a team investigating the shooting of a Brazilian man police mistakenly thought was a suicide bomber. The Brazilian government wants to get a clear picture of the events leading up to the shooting of Jean Charles de Menezes, and to find out if media reports about the investigation based on a leak are accurate. The mother of Mr. de Menezes, Maria, says the policeman who killed him should be punished. Tom Gibb reports from Brazil:
Maria de Menezes said her only desire now was to see justice done. She said she didn't want to see any other mother suffer as she has. The family say they are glad that documents and pictures of Jean Charles de Menezes after he'd been shot which contradict the original police version have been made public. They say they knew from the start that he had no reason to run from the police and world never have jumped over a barrier of an underground station.
According to the news, why was the Brazilian man killed？

A. He was a murderer.
B. He was a spy.
C. He was expected as a terrorist.
D. He was taken for a robber.

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听力原文： Most people think of astronomers as people who spend their time in cold observatories peering through telescopes every night. In fact, a typical astronomer spends most of his or her time analyzing data and may only be at the telescope for a few weeks of the year. Some astronomers work on purely theoretical problems and never use a telescope at all.
You might not know how rarely images are viewed directly through telescopes. The most common way to observe the skies is to photograph them. The process is very simple. First a photographic plate is coated with a light-sensitive material. The plate is positioned so that the image received by the telescope is recorded on it. Then the image can be developed, enlarged and published so that many people can study it.
Because most astronomical objects are very remote, the light we receive from them is rather feeble. But by using a telescope as a camera long-time exposures can be made.
In this way, objects can be photographed that are a hundred times too faint to be seen by just looking through a telescope.
According to the speaker, what do people often think about astronomers？

A. They spend most of their time looking through telescopes.
B. They are constantly analyzing data.
C. They often live near observatories.
D. They devote a lot of time to theoretical problems.

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What did the man's mother most desire to do at the present？

A. To kill the man Who had shot his son.
B. To tell the media the truth.
C. To return home with the dead body.
D. To redress an injustice.

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A. North Korea agreed to hold peace talks with South Korea B. North Korea violated the Nuclear Non-Proliferation Treaty C. North Korea signed an agreement to abandon its nuclear weapons D. North Korea abandoned its use of nuclear power

What is one reason astronomers make long-time exposures？

What did the man's mother most desire to do at the present？

A. North Korea agreed to hold peace talks with South Korea
B. North Korea violated the Nuclear Non-Proliferation Treaty
C. North Korea signed an agreement to abandon its nuclear weapons
D. North Korea abandoned its use of nuclear power