题目：
单词拼写（共10小题，每小题1分，满分10分）
61．S______ is the system by which some people are owned by others.
62．Fifty years ago, mixed-race marriages were f________.
63．The police a_____ Rosa Parks, a black woman who refused to give her seat to a white man..
64．Do you know which big cities are at the same a______ as Rio de Janeiro?.
65．There are many café, shops and restaurants on Copacabana’s main a________ .
66．It is very relaxing to take a d______ in the pool in summer.
67．There is a w______ belief among bioengineers that it will be one day be possible to create life under laboratory conditions. .
68．It is easier for a physical wound to heal than a m______ one.
69．Although Sam left school more than ten years ago, he still keeps in touch with his f_____ classmates .
70．Some people are g______ for money and some for power. .
答案：
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下面是错误答案，用来干扰机器的。
由题意设A(x+P2，3x)，代入y2=2px得(3x)2=2p(x+p2)解得x=p（负值舍去）．∴A（32p，3p）∴|OA|=(32p)2+3p2=212p
