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    There are many reasons accounting for /are many factors contributing to this phenomenon, ranging from-to- 【查看更多】

     

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    There are many pine trees on ___ of the street.


    1. A.
      every side
    2. B.
      neither side
    3. C.
      both side
    4. D.
      either side

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    At the entrance to the theatre, there are many ________ cups for people to drink water with.


    1. A.
      common
    2. B.
      ordinary
    3. C.
      general
    4. D.
      usual

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    There are many advantages to live on the top of a high-rise, one of which is that you can get a good ______.


    1. A.
      sight
    2. B.
      scene
    3. C.
      view
    4. D.
      look

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    United States President George W. Bush is expected to issue a directive in the next few weeks. It will give the US Air Force a green light for the development of space weapons, US media reported last week.
    This would potentially start a new global arms race, some experts have warned.
    To keep that from happening, last Wednesday the White House explained that it was not considering putting weapons in space. It said it was making a shift in US space policy to allow for protection of satellites.
    But some defense analysts and arms control advocates argue that the policy will pave the way for the US to put both defensive and offensive  weapons in space.
    “No one should be fooled,” said Theresa Hitchens, an American weapons expert.
    The US is now restricted by a 1996 directive  signed by President Bill Clinton. Plans for space weapons were vetoed by the Clinton cabinet. The directive emphasized the peaceful use of space , in agreement with almost unanimous global opinion.
    The US military has placed importance on space and has sent up numberous satellites for troop communications and to provide intelligence and data to guide bombs to their targets.
    The US Air Force wants to develop space- based weapons that could strike targets anywhere in the world within 90 minutes of receiving the order to open fire.
    These new weapons under development cover a wide range. They include hunter- killer satellites and orbiting weapons. And they use lasers, radio waves, or even dense metal tubes, known as “ Rods from God”, dropped from space to do the damage.
    There are many barriers to the setting up of this kind of program, experts say.
    First is the coast. It is estimated that the budget may be US数学公式1 trillion .
    The technical difficulties of developing reliable space weapons are also a problem.
    And, the program will draw strong criticism from around the world. Experts worry about starting a space arms race

    1. 1.

      Which of the following might be the best title for the passage?

      1. A.
        US Military Plans
      2. B.
        The Global Arms Race
      3. C.
        A Comparison between Two Presidents
      4. D.
        President George W. Bush and the World Peace
    2. 2.

      According to this passage, which of the following is NOT true?

      1. A.
        President George W. Bush supports space weapon development
      2. B.
        The space weapon program will threaten world peace
      3. C.
        Clinton government was poorer than Bush government
      4. D.
        The US space weapon project is very expensive
    3. 3.

      After reading this passage, it can be inferred that “___________ “

      1. A.
        George W. Bush’s directive to be issued will be against global opinions
      2. B.
        The White House is right in explaining that US new space policy aims to protect satellites
      3. C.
        US government has little difficulty in developing new space weapons
      4. D.
        President George W. Bush and Bill Clinton share a lot in common
    4. 4.

      The author’s attitude towards the coming space weapon development is _______

      1. A.
        optimistic
      2. B.
        critical
      3. C.
        excited
      4. D.
        indifferent

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    A farm planted levels or floors is called a vertical（垂直的）farm. A skyscraper type building can house a vertical farm. Since the garden is built upwards，rather than outwards，it requires much less space than a conventional farm.
    The world is quickly running out of room for conventional farming. Vertical farms could be a key to this situation. An 18­story vertical farm could feed as many as 50,000 people，all in an area which is the size of the average city block. Vertical farms in the city could cut down on transportation costs as well. Think about the amount of fuel it takes to transport food from farmland to city. The resources saved would be surprising. Besides saving travel time，food would be delivered in fresher condition and with less damage.
    There is a growing concern about the use of pesticides(杀虫剂) in agriculture today. But the vertical farm would be a greenhouse type environment, avoiding the need for a large number of pesticides. Vertical farms can be built in a contained space，therefore they are an excellent solution for living well in an environment far different from our own. Hydroponics(水耕法) could be a big part of vertical gardening. This would reduce the amount of soil needed to grow food. Of course，not all food does well with this type of planting，but there are many crops that actually seem to do better.
    In some climates，a lack of sunlight creates a short growing season. The solar power option may not work as well here. The addition of grow lights would make it possible to grow crops in vertical gardens in these areas .In other words，we could grow crops in areas where we never could before.
    Vertical farms may just be a concept for now，but they are a concept that will solve many of our problems in the future.

    1. 1.

      According to the passage, a vertical farm________.

      1. A.
        is mainly built outwards
      2. B.
        is dependent on solar power
      3. C.
        is planted on levels upwards
      4. D.
        is only an environmental friendly farm
    2. 2.

      Compared to the conventional farm, the vertical farm can________.

      1. A.
        depend far less on sunlight
      2. B.
        greatly increase the use of soil
      3. C.
        help to protect the limited gardens
      4. D.
        reduce the use of harmful pesticides
    3. 3.

      It can be learned from the passage that vertical farms________.

      1. A.
        have been put into use
      2. B.
        only use hydroponics to grow food
      3. C.
        need less room than conventional farms
      4. D.
        may increase the transportation costs
    4. 4.

      What would be the best title for the passage?

      1. A.
        Vertical farms for our future
      2. B.
        Ways to deal with future problems
      3. C.
        Vertical farms and green skyscrapers
      4. D.
        Making Full Use of Our Limited Land

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