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    　　Scientists have created a tomato that can grow on salty water．The plant is the first crop of its kind ever produced in the world．

    　　Its significance can not be overestimated(过高估计)．The new technology can help mankind solve the problem of feeding its ever-growing population．It is estimated that by 2050 the world population will rise to more than 9 billion, an increase of 3 billion over 2000．Each day 240 000 more people are born, ready to be fed like the rest of us．

    　　Unfortunately, not all the land on Earth can be used to grow crops of humans．About 24．7 million acres of land is lost to agriculture each year because the land has become too salty．The main cause of the problem is irrigation．When farmers water their crops, salts in the water also enter the soil．Over time, salts such as sodium and calcium build up to such a point that they severely harm the growth of crops．Salts destroy most plants’ ability to draw up water through their roots．

    　　But, the new type of tomato produced by American and Canadian scientists can store salts in its leaves so that the fruit doesn’t taste salty．Researchers hope this technology will enable areas of poor-quality land to become productive some day．And they can feed some of the world’s growing population．

    (1)

    What is the significance of this new technology?

    [　　]

    A．

    It can relieve the burden of feeding the growing population．

    B．

    It can help the plant completely absorb salts in the soil．

    C．

    It can make the desert into the good-quality field．

    D．

    It can make the land less salty．

    (2)

    We can know from the third Paragraph that ________．

    [　　]

    A．

    the land has been polluted seriously

    B．

    irrigation results in more salts in the land

    C．

    people add salts to the water and the land

    D．

    rain and snow will increase salts in the land

    (3)

    Why do salts left in the soil harm the growth of crops?

    [　　]

    A．

    Salts in the water enter the soil when farmers water their crops．

    B．

    Salts upset crops’ ability to absorb water through their roots．

    C．

    The growth of crops needs lots of salts．

    D．

    The growth of crops doesn’t need salts at all．

    (4)

    Which of the following is NOT true according to the passage?

    [　　]

    A．

    The new type of tomato can grow on salty water．

    B．

    The new type of tomato can store the salts in its leaves．

    C．

    The new type of tomato can help to provide food for the growing population．

    D．

    The writer is not optimistic．

    答案：1．A;2．B;3．B;4．D;
    解析：

    (1)

    细节理解题。第二段“The new technology can help mankind solve the problem of feeding its ever-growing population．”可知这个新技术的重要意义。

    (2)

    推理判断题。第三段第三句说明灌溉导致土壤中的盐的含量大增。

    (3)

    细节理解题。第三段最后一句说明大量的盐损坏了植物从根部吸收水分的能力。

    (4)

    细节判断题。此新技术会解决为日益增长的人口提供食物的问题，因此作者的态度是乐观的。


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    阅读下列短文，从A、B、C、D四个选项中选出最佳选项。

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