题干

下面文段有三处推断存在问题,请参照①的方式,说明另外两处问题。

云南的“思茅市”改成“普洱市”,四川的南坪县更名为九寨沟县后,城市的知名度都有了很大的提高,经济有了较快发展,可见,更名必然带来城市的发展。我市的名字不够响亮,这严重影响了我们的经济发展。如果更名,就一定会带来我市的经济腾飞,因此,更名的事要尽快提到日程上来。

①更名并不一定能带来城市的发展。

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上一题 下一题 0.0难度 选择题 更新时间:2019-11-13 05:50:46

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城市名字不够响亮并不一定会严重影响经济的发展,更名不一定会带来经济腾飞

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阅读理解

    Nowadays it's believed that the largest contributors to air pollution are gasoline vehicles. They not only give off harmful gases but also dangerous and heavy metal particles(微粒) that can result in environmental dangers. We can't stop using vehicles and thus stop air pollution right away. However, at least we can look for better replacements so that air pollution can be reduced. According to studies, hydrogen (氢)cars prove to be a better replacement for traditional cars.

    A hydrogen car is a vehicle that uses hydrogen as fuel for its engine to work. There are two types of hydrogen cars. The first one is to use hydrogen as a fuel, and the second one is to use hydrogen fuel cells(电池) to provide power for the car. Hydrogen and oxygen react chemically with each other to produce electricity, thus starting the car.

    There are many advantages of hydrogen cars. For example, hydrogen is available in plenty. Therefore, you needn't worry about a lack of hydrogen. More importantly, no harmful gases are released as by-products .The only by-products are water and a little amount of heat so air pollution is prevented up to a large extent.

    However, there are also some problems with hydrogen cars. For instance, in case of damage, the cost of repairing and replacing fuel cells is high. Worse still, hydrogen is a material which can burn easily, so it can result in a huge explosion of the car.

    The concept of hydrogen cars is relatively new for most people. Research is still in progress to reduce disadvantages and increase advantages. Therefore, hydrogen cars are expected to contribute their bit towards making this planet better and healthier!