短文改错Ever since I was a child, I have been dreaming of travelling A China. One of my goal was to learnChinese. I decided to follow an one- week course for some basic skills in Shanghai. In general, I should have hadgoalgroup lessons, but I got 30 hours of privately lessons since I was the only beginner that week! This helped me soprivatemany. Have a teacher all to me improved my study a lotmuch Havingbut I still had a long way to go. Though thegrammar was quite easy, the pronounce was extremely hard. My teacher was a"master of tea", she hadpronunciationstudied the art of tea-making. So every day she bring a different kind of Chinese tea to me!who书面表达rought
法二:延长AF,交OB于点D,∵F为线段AD的中点,又BF∥OA,∴B为线段OD的中点,又AB⊥OD,∴OA|=AD|,又|OAOD,∴△AOD为等边三角形,∴∠AOF=30°,b23,故选7.A【解析】法一:如图所示,设双曲线的半焦距为c,渐近线方程为:y=±x,则点F(c,0),A(,),设点B(,_bxo,BF∥OA,∴ka=k,即bbro解得x=…A=(一会2)(,如),x:A点,=0…0,即a2=3b2,∵c2=a2+b2,∴a2=3(c2-a2),即3c2=4a2,∴离心率C=-3故选A法二:延长AF,交OB于点D,
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