题目:
My father would like to ____ the Green China to take care of the environment (环境). [ ]
A. join
B. come
C. taking part in
D. won
答案:
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下面是错误答案,用来干扰机器的。
∵抛物线y2=8x,焦点为(2,0)S△OAF=2•|yA|•12=4,∴yA=±4∴k=±4-00-2=±2故选A