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    The idea of the robot ­­ by a Czech playwright. The word “robot means “work in the Czech language and that is what they to do. A. was invented; intended B. was invented; are intended C. is invented; intend D. is invented; are intended 【查看更多】

     

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    America’s greatest technological achievement, the Hoover Dam, now has a companion piece, a bridge held up by the longest arch in the Western Hemisphere（半球）. The Mike O’Callaghan-Pat Tillman Memorial Bridge, which opened this month and connects the U.S. states of Arizona and Nevada, crosses the vast chasm（峡谷）890 feet above the Colorado River that is controlled by the dam.

    The striking 1,900-foot-long structure will improve traffic in the region and help protect the dam from being destroyed. It is the seventh highest bridge in the world, behind four in China, one in Papua New Guinea and one in the US state of Colorado.

    “The Hoover Dam is the greatest civil engineering achievement in America’s history,” said the bridge project manager Dave Zanatell. “Our goal was not to outdo or outshine it. Our goal was to, in a respectful way, do something that would be great for our generation and that would stand besides Hoover Dam in a respectful and quality way that would become a part of Hoover’s legacy（遗产）.”

    Just as the Hoover Dam was built in the heart of the Great Depression（大萧条）and was seen as an example of the nation’s can-do spirit, some hope this project can also provide some uplift.

    The bridge is surprising: at 1,050 feet, its support arch holds up a roadway that lies on 300-foot-long concrete pillars（柱子）, some of the tallest in the world. It contains 16 million pounds of steel.

    　　The idea of the bridge came into being in the 1960s because the top of the Hoover Dam has been a narrow two-lane road that is the fastest route from Arizona to Las Vegas and then the Pacific Northwest and Canada.

      　Access to the dam from each direction is a dangerously winding route, but massive trucks and passenger vehicles shared it for decades. During the day, when thousands of tourists travel to the dam from Las Vegas three times as many accidents as on a normal road will happen.

      　The bridge has a sidewalk on the side facing the dam. The wall on both sides is 54 inches high, so walkers can take photos there.

    1.Which of the following is true of the Hoover Dam?

       A. It was completed recently.

       B. It was built during the hard times.

       C. It has the longest arch.

       D. It’s the seventh highest dam in the world.

    2.What is one of the purposes of building the bridge?

       A. To protect the dam.                                            B. To save the cultures.

       C. To outdo the dam.                                                   D. To develop the tourism.

    3.The underlined word “uplift” in Paragraph 4 means _____.

       A. lift of the heavy object                              B. support in money

       C. spiritual encouragement                                   D. instruction in technology

    4.Which of the followings shows the right position of the bridge and dam?

    5.The text is mainly about ______.

       A. the Hoover Dam                                                 

       B. American western development

       C. a tour along the Colorado River                      

       D. a recently built bridge

     

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    America’s greatest technological achievement, the Hoover Dam, now has a companion piece, a bridge held up by the longest arch in the Western Hemisphere（半球）. The Mike O’Callaghan-Pat Tillman Memorial Bridge, which opened this month and connects the U.S. states of Arizona and Nevada, crosses the vast chasm（峡谷）890 feet above the Colorado River that is controlled by the dam.
    The striking 1,900-foot-long structure will improve traffic in the region and help protect the dam from being destroyed. It is the seventh highest bridge in the world, behind four in China, one in Papua New Guinea and one in the US state of Colorado.
    “The Hoover Dam is the greatest civil engineering achievement in America’s history,” said the bridge project manager Dave Zanatell. “Our goal was not to outdo or outshine it. Our goal was to, in a respectful way, do something that would be great for our generation and that would stand besides Hoover Dam in a respectful and quality way that would become a part of Hoover’s legacy（遗产）.”
    Just as the Hoover Dam was built in the heart of the Great Depression（大萧条）and was seen as an example of the nation’s can-do spirit, some hope this project can also provide some uplift.
    The bridge is surprising: at 1,050 feet, its support arch holds up a roadway that lies on 300-foot-long concrete pillars（柱子）, some of the tallest in the world. It contains 16 million pounds of steel.
    　　The idea of the bridge came into being in the 1960s because the top of the Hoover Dam has been a narrow two-lane road that is the fastest route from Arizona to Las Vegas and then the Pacific Northwest and Canada.
    　Access to the dam from each direction is a dangerously winding route, but massive trucks and passenger vehicles shared it for decades. During the day, when thousands of tourists travel to the dam from Las Vegas three times as many accidents as on a normal road will happen.
    　The bridge has a sidewalk on the side facing the dam. The wall on both sides is 54 inches high, so walkers can take photos there.
    【小题1】Which of the following is true of the Hoover Dam?

    A．It was completed recently.
    B．It was built during the hard times.
    C．It has the longest arch.
    D．It’s the seventh highest dam in the world.
    【小题2】What is one of the purposes of building the bridge?
    A．To protect the dam.B．To save the cultures.
    C．To outdo the dam.D．To develop the tourism.
    【小题3】The underlined word “uplift” in Paragraph 4 means _____.
    A．lift of the heavy objectB．support in money
    C．spiritual encouragementD．instruction in technology
    【小题4】Which of the followings shows the right position of the bridge and dam?

    【小题5】The text is mainly about ______.
    A．the Hoover Dam
    B．American western development
    C．a tour along the Colorado River
    D．a recently built bridge

    查看答案和解析>>

    America’s greatest technological achievement, the Hoover Dam, now has a companion piece, a bridge held up by the longest arch in the Western Hemisphere（半球）. The Mike O’Callaghan-Pat Tillman Memorial Bridge, which opened this month and connects the U.S. states of Arizona and Nevada, crosses the vast chasm（峡谷）890 feet above the Colorado River that is controlled by the dam.

    The striking 1,900-foot-long structure will improve traffic in the region and help protect the dam from being destroyed. It is the seventh highest bridge in the world, behind four in China, one in Papua New Guinea and one in the US state of Colorado.

    “The Hoover Dam is the greatest civil engineering achievement in America’s history,” said the bridge project manager Dave Zanatell. “Our goal was not to outdo or outshine it. Our goal was to, in a respectful way, do something that would be great for our generation and that would stand besides Hoover Dam in a respectful and quality way that would become a part of Hoover’s legacy（遗产）.”

    Just as the Hoover Dam was built in the heart of the Great Depression（大萧条）and was seen as an example of the nation’s can-do spirit, some hope this project can also provide some uplift.

    The bridge is surprising: at 1,050 feet, its support arch holds up a roadway that lies on 300-foot-long concrete pillars（柱子）, some of the tallest in the world. It contains 16 million pounds of steel.

    　　The idea of the bridge came into being in the 1960s because the top of the Hoover Dam has been a narrow two-lane road that is the fastest route from Arizona to Las Vegas and then the Pacific Northwest and Canada.

      　Access to the dam from each direction is a dangerously winding route, but massive trucks and passenger vehicles shared it for decades. During the day, when thousands of tourists travel to the dam from Las Vegas three times as many accidents as on a normal road will happen.

      　The bridge has a sidewalk on the side facing the dam. The wall on both sides is 54 inches high, so walkers can take photos there.

    Which of the following is true of the Hoover Dam?

       A. It was completed recently.

       B. It was built during the hard times.

       C. It has the longest arch.

       D. It’s the seventh highest dam in the world.

    What is one of the purposes of building the bridge?

       A. To protect the dam.                                 B. To save the cultures.

       C. To outdo the dam.                                       D. To develop the tourism.

    The underlined word “uplift” in Paragraph 4 means _____.

       A. lift of the heavy object                            B. support in money

       C. spiritual encouragement                           D. instruction in technology

    Which of the followings shows the right position of the bridge and dam?

    The text is mainly about ______.

       A. the Hoover Dam                                    

       B. American western development

       C. a tour along the Colorado River               

       D. a recently built bridge

    查看答案和解析>>

    America’s greatest technological achievement, the Hoover Dam, now has a companion piece, a bridge held up by the longest arch in the Western Hemisphere（半球）. The Mike O’Callaghan-Pat Tillman Memorial Bridge, which opened this month and connects the U.S. states of Arizona and Nevada, crosses the vast chasm（峡谷）890 feet above the Colorado River that is controlled by the dam.

    The striking 1,900-foot-long structure will improve traffic in the region and help protect the dam from being destroyed. It is the seventh highest bridge in the world, behind four in China, one in Papua New Guinea and one in the US state of Colorado.

    “The Hoover Dam is the greatest civil engineering achievement in America’s history,” said the bridge project manager Dave Zanatell. “Our goal was not to outdo or outshine it. Our goal was to, in a respectful way, do something that would be great for our generation and that would stand besides Hoover Dam in a respectful and quality way that would become a part of Hoover’s legacy（遗产）.”

    Just as the Hoover Dam was built in the heart of the Great Depression（大萧条）and was seen as an example of the nation’s can-do spirit, some hope this project can also provide some uplift.

    The bridge is surprising: at 1,050 feet, its support arch holds up a roadway that lies on 300-foot-long concrete pillars（柱子）, some of the tallest in the world. It contains 16 million pounds of steel.

    　　The idea of the bridge came into being in the 1960s because the top of the Hoover Dam has been a narrow two-lane road that is the fastest route from Arizona to Las Vegas and then the Pacific Northwest and Canada.

      　Access to the dam from each direction is a dangerously winding route, but massive trucks and passenger vehicles shared it for decades. During the day, when thousands of tourists travel to the dam from Las Vegas three times as many accidents as on a normal road will happen.

      　The bridge has a sidewalk on the side facing the dam. The wall on both sides is 54 inches high, so walkers can take photos there.

    1．Which of the following is true of the Hoover Dam?

       A. It was completed recently.

       B. It was built during the hard times.

       C. It has the longest arch.

       D. It’s the seventh highest dam in the world.

    2．What is one of the purposes of building the bridge?

       A. To protect the dam.                                 B. To save the cultures.

       C. To outdo the dam.                                       D. To develop the tourism.

    3．The underlined word “uplift” in Paragraph 4 means _____.

       A. lift of the heavy object                      B. support in money

       C. spiritual encouragement                           D. instruction in technology

    4．Which of the followings shows the right position of the bridge and dam?

    5．The text is mainly about ______.

       A. the Hoover Dam                                    

       B. American western development

       C. a tour along the Colorado River               

       D. a recently built bridge

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    阅读理解

    　　Medical drugs sometimes cause more damage than they cure．One solution to this problem is to put the drugs inside a capsule, protecting them from the body-and the body from them-until they can be released at just the right spot．There are lots of ways to trigger(引发)this release, including changing temperature, acidity, and so on．But triggers can come with their own risks-burns, for example．Now, researchers in California have designed what could be a harmless trigger to date：shining near-infrared light(NIR,近红外线)on the drug in the capsule．

    　　The idea of using light to liberate the drug in the capsule isn't new．Researchers around the globe have developed polymers(聚合物)and other materials that begin to break down when they absorb cither ultraviolet(UV,紫外线)or visible light．But tissues also readily absorb UV and visible light, which means the drug release can be triggered only near the skin, where the light can reach the capsule．NIR light largely passes through tissues, so researchers have tried to use it as a trigger．But few compounds(化合物)absorb NIR well and go through chemical changes．

    　　That changed last year when Adah Almutairi, a chemist at the University of California, San Diego, reported that she and her colleagues had designed a polymer that breaks down when it absorbs NIR light．Their polymer used a commercially available NIR-absorbing group called o-nitrobenzyl(ONB)．When they catch the light, ONB groups fall off the polymer, leading to its breakdown．But ONB is only a so-so NIR absorber, and it could be poisonous to cells when it separates from the polymer．

    　　So Almutairi and her colleagues reported creating a new material for capsules that's even better．This one consists of a long chain of compounds called cresol groups linked in a polymer．Cresol contains reactive(易反应的)components that make it highly unstable in its polymeric form, a feature Almutairi and her colleagues use to their advantage．After polymerizing the cresols, they cap each reactive component with a light-absorbing compound called Bhc．When the Bhcs absorb NIR light, the reactive groups are exposed and break the long polymer into two short chains．Shining additional light continues this breakdown, potentially releasing any drugs in the capsule．What's more, Almutairi says, Bhc is 10 times better at absorbing NIR than is ONB and is not poisonous to cells．

    (1)

    According to the passage, which of the following could be the best trigger?

    [　　]

    A．

    Temperature change．

    B．

    NIR light．

    C．

    Acidity change．

    D．

    UV light．

    (2)

    Why in ONB unsatisfactory?

    [　　]

    A．

    It breaks down when it absorbs NIR light．

    B．

    It falls off the polymer and triggers drug release．

    C．

    It has not come onto the market up till now．

    D．

    It is not effective enough and could be poisonous．

    (3)

    Which word can be used to complete the following process of changes?

    [　　]

    A．

    Protected

    B．

    formed

    C．

    exposed

    D．

    combined

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