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物价水平保持低位运行有利于居民生活质量提高。()

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GDP的变化和利润的变化是相关的。()

Interest in historical methods has arisen less through external challenge to the validity

A distinction is usually made between "negative" and "positive" genetic engineering. In negative genetic engineering we try to eliminate harmful genes to produce genetically normal people. The aim is of course a desirable one; however, it does pose the problem of what a harmful gene is. Genes are not really either "good" or "bad". The gene which causes certain forms of anaemia, for example, can also protect against malaria. If we eliminate this gene we may get rid of anaemia, but we increase the risk of malaria.
In positive genetic engineering we try to create better people by developing the so-called "good" genes. 72. But although this form. of genetic engineering will give us greater control over mankind's future, there are several reasons for caution. First there is the possibility of mistakes. While aceepting that geneticists are responsible people, we must also admit that things can be wrong, the result being the kind of monster we read about in horror stories. Secondly, there is the problem of deciding what makes a "better" person. We may feel, for example, that if genetic engineering can create more intelligent people, then this is a good thing. On the other hand, intelligence does not necessarily lead to happiness. Do we really want to create people who are intelligent, but perhaps unhappy？
73. The basic question is whether or not we should interfere with human life. We can argue that much human progress (particularly in medicine ) involves interference with life. To some extent this is true; but we should not forget the terrible consequences genetic engineering can have. Consider for example the possibilities of genetic warfare, in which our enemies try to harm us using the techniques of genetic engineering ...
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Part B
Below is a graph showing the average number of hours a student spends on the computer per week. Look at the graph and write an essay of about 120 words making reference to the following points:
(1)The change of the hours a student spends on the computer per week from 1995 to 2005;
(2) The possible reasons of the change and the problems and difficulties college students face when they use computers.