词汇。(每小题1分,共10分) A. 根据句意及首字母提示补全单词,使句子完整、通顺。 1. In Japan people speak J .2. The UK is short for the United K .3. — How many c do you like? — Three. I like America, Singapore and France. 4. Toronto and Ottawa are both cities in C .5. Sydney is a beautiful city in A .B. 根据句意及汉语提示补全单词(词组),使句子完整、通顺。 6. That book is too 己知F1,F2是椭圆的两个焦点,过F1且与椭圆长轴垂直的直线交椭圆于A、B两点,若△ABF2是等腰直角三角形,则这个椭圆的离心率是 .