题目内容

3．Trains with the first letter D or Z can run __________ a speed of more than 200kilometers an hour when it travels __________ the desert．（　　）
A．with； crossB．in； throughC．at； acrossD．for； in

分析 首字母是D或Z的火车在沙漠行驶的时候，可以达到每小时200公里的速度．

解答 答案C．考查介词．at a speed of以…速度，travel across穿过…的表面，选C．across为介词，而cross为动词，此处需要介词，排除cross．through为在立体空间中的"穿过"，即是从一头（边）贯穿到另一头（边）．

点评 考查介词辨析的题，留意固定搭配．

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13．Recently there was a major discovery in the scientific research-the mapping of all DNA in a human gene（基因） is complete．Couple of years ago，this seems an impossible task for scientist to accomplish．All this progress in science leads us to believe that the day，when the human being will be cloned，is not far away．Human cloning has always been a topic of argument，in terms of morality or religion．
    Taking a look at why cloning might be beneficial，among many cases，it is arguable that parents who are known to be at risk of passing a genetic limitation to a child could make use of cloning．If the clone was free of genetic limitations．then the other clone would be as well．The latter could foe inserted in the woman and allowed to ripen to term．Moreover，cloning would enable women，who can't get pregnant，to have children of their own．
    Cloning humans would also mean that organs could be cloned，so it would be a source of perfect transfer organs．This，surely would be greatly beneficial to millions of unfortunate people around the world that are expected to lose their lives due to failure of single （or more） organ （s）．It is also arguable that a ban on cloning may be unlawful and would rob people of the right to reproduce and limit the freedom of scientists．
    Arguments against cloning are also on a perfectly practical side．Primarily，I believe that cloning would step in the normal"cycle"of life．There would be a large number of same genes，which reduce the chances of improvement，and，in turn，development-the fundamental reason how living things naturally adapt to the ever-changing environment．Life processes failing to do so might result in untimely disappearance．Furthermore，cloning would make the uniqueness that each one of us possesses disappear．Thus，leading to creation of genetically engineered groups of people for specific purposes and，chances are，that those individuals would be regarded as"objects"rather than people in the society．
    Scientists haven't 100 per cent．guaranteed that the first cloned humans will be normal．Thus this could result in introduction of additional limitations in the human"gene-pool"．
    Regarding such arguable topics in"black or white"approach seems very innocent to me personally．We should rather try to look at all"shades"of it．I believe that cloning is only legal if its purpose is for cloning organs； not humans．Then we could regard this as for"saving life"instead of"creating life"．I believe cloning humans is morally and socially unacceptable．
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