calm quiet silent三者区别

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• 1.We are living a ___ life.A.still B.quiet C.calm D.silent2.No one ______of it.A.dared to speaking B.dared speak C.can dared speak D.dare speaking3.--Have you moved into the new house?--Not yet.The rooms _____.A.are painting B.are being painted C.are painted D.have painted4.The speech is strongly impressed_____my memory.A.to B.over C.by D.on5.At this moment the bell rang,____the end of class .A.announced B.having announced C.announcing D.to announce
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• calm、quiet、silent的区别（别太难懂）
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• 已知点P（Xo,Yo)和圆x^2+y^2+Dx+Ey +F=0的关系若C:x^2+y^2+Dx+Ey+F=0_____0,则点P（XoYo)在圆C外;（大于或小于)
• 椭圆E：x^2/a^2+y^2/b^2=1(a>b>0)的离心率为e,P为E上一点,从P向圆x^2+y^2=b^2作切线PA、PB,A、B为切点,问是否存在点P,使PA⊥PB?若存在,求出点P坐标；若不存在请说明理由.（高二选修1-1