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保存数字音乐可以采用MIDI格式、MP3格式等，请说明这两种音频文件格式的特点。

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Are some people born clever, and others born stupidly？【S1】__
Or is intelligence developed by our environment and our experiences？ To some
extent our intelligence is given us at birth,and no amount of special education can do a【S2】
genius out of a child born with low intelligence.On the other hand, a child who lives in
a bored environment will develop his 【S3】_ intelligence less than one who lives in a rich and varied surroundings.Thus the limits of【S4】
a person's intelligence are fixed at birth, whether or not he reaches those limits will
depend on their environment. This view, now held by most experts, can be supported in 【S5】
a number of ways.It is easy to show that intelligence is at some extent something we are【S6】
born with. The closer the blood relationship between two persons, the closer they are
like to be in intelligence.Thus if we take two unrelated people at random from 【S7】
population,it is likely that their degrees of intelligence will be complete different.If
on 【S8】
the other hand we take two identical twins,they will very likely be as intelligent as each
other. Relations like brothers and sisters, parents and children usually have different 【S9】
intelligence. This conclusion is also suggested by the fact that people who live in close
contact with each other,but who is not related at all,are likely to have similar degrees【S10】____
of intelligence.
【S1】

Part B
Below is a table showing the bus and the subway as means of city traffic. Look at the table and write an essay about 120 words making reference to the following points:
1. a comparison between the bus and subway by using the features given
2. the advantages and disadvantages of the two transportation tools
3. your proposal of means of city traffic

No matter what the methods we use, the final result is that we will need to decrease CO2emissions by 70% to 0% simply to stabilize ______.

文中“我又暗暗为这座辉煌建筑的废墟历经漫长的风雨得以保存至今而庆幸”一句在文中有什么作用？