题目：
Questions 53 to 57 are based on the following passage:(10分)To the people of ancient Egypt,life on earth was short.Life after death,however,was eternal. Therefore they built their tombs of stone and they took their possessions with them into another world. The more important the people,the greater the tomb.The Pharaohs were the rulers of the country and when they died they became gods.Many of their tombs remain,and some have become a wonder of the world.These are the pyramids.The purpose of these stone mountains was to protect the burial chamber form the weather and from thieves who might try to steal the gold,jewels and precious possessions placed there to accompany the dead ruler into eternal life.Their shape,with four triangular sides spreading from a single point,represented the rays of the sun.their position on the west bank of the River Nile was where the sun set every day and where they believed it began its journey into the other world.All the burial grounds in ancient Egypt were on the west bank of the river.
Why did the people of ancient Egypt build their tombs of stone
A．Because they thought life on the earth was short,but life after death was eternal.
B．Because they wanted to bring all their possessions into another world.
C．Because they wanted to protect their possessions into another world.
D．All of the above.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：是指两项专利之间存在实施时的依赖关系，前一项专利的实施需要使用后一项专利，或者相反。
