题目

In China, peach is a         of long life and therefore makes an ideal birthday present. A.symbol           B.sign            C.signal            D.symptom 答案:A如图①,为⊙的直径,与⊙相切于点,与⊙相切于点,点为延长线上一点,且CE=CB. (1)求证:为⊙的切线;(2)如图②,连接AE,AE的延长线与BC的延长线交于点G.若,求线段BC和EG的长.
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