题目

首字母填空 根据短文内容及首字母提示，填写所缺单词，使短文意思完整，每空一词。 In our life, one spends the most time being with oneself. But one has the least understanding of oneself. When you are s   1  , you may be very proud. When you fail, you may lose heart. If you don’t get a thorough(充分的) understanding of yourself, you may m  2   many chances in life.    To get a thorough understanding of yourself is to know well about yourself. You may realize your strong points and weak o  3   . You may hope for a wonderful f   4  , bu已知AB是⊙O的直径，弦AC平分∠BAD，AD⊥CD于D，BE⊥CD于E．求证：（1）CD是⊙O的切线；（2）CD2=AD•BE．