69.答案C。此处为固定搭配pay...for...为…支付…
70.答案A。原文意为：但我不会和你们住在一起，此处需选择有转折关系的连词，因此选择A)。B)So因此；C)Therefore 所以；D)Then然后。
71.答案B。此处需一个引导定语从句的连词，由于先行词为the hill表地点，因此选择关系副词where。
72.答案C。此处原文意为：…他做饭…，而并非特指早饭，中饭或晚饭，因此选择C。
73.答案A。此句为比较状语从句，只有A可体现比较级，其他均为程度副词。
Section B
S1.【参考答案】Because there’re numerous sounds around us.
S2.【参考答案】our mood changes。
S3.【参考答案】six
S4.【参考答案】Practice helps improve our sense of hearing.
S5.【参考答案】pleasure and information.
PART Ⅳ WRITING
Sample Writing
What Would Happen If There were No Power
Ever since early the last century,electricity has become an essential part of our modern life.Our industrial and agricultural production depends on it to run various kinds of machines.The modern wonder computers work on electricity too.It provides light,heat and power for us.If we want to watch TV or films or to listen to the radios we also need it.Nobody can deny that the development of our civilization depends on electricity.If there were no electric power,our modern world would be in trouble.For one thing all the wheels would stop because the motors that power the machines would fail.For another,many,if not all,of our industries would cease production.All the world transport system,in addition,would be felt on the world’s communication systems.Thus our modern world would be impossible without electricity.
Therefore,we should make better use of electric power. On the other hand,we should educate people to economize using electricity and not to waste the energy resources with no thought for the future.At the same time we must do our best to exploit more electric resources to meet the requirements of the human beings and to avoid energy crisis in the future.
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