【简答题】Way back in 1662,John Evelyn,a brilliant Englishman known for his detailed diaries,wrote about disastrous effects of coal-burning on the city of London .In it,he described an infernal scene of smog.ai...
【简答题】II.根据句意选择单词或短语,并用适当形式填空(每词只能使用一次)。 spill brilliant smash sliver of incredible steep breathtakingly twinkle whisper crush 56. She closed her eyes against the __________light. 57. Mother found some_____...
【简答题】如图,在平面直角坐标系 xOy 中,已知椭圆 C : ( a > b >0) 经过点(1, e ),其中 e 为椭圆的离心率. F 1 、 F 2 是椭圆的两焦点, M 为椭圆短轴端点且△ MF 1 F 2 为等腰直角三角形. (1) 求椭圆 C 的方程; (2) 设不经过原点的直线 l 与椭圆 C 相交于 A 、 B 两点,第一象限内的点 P (1, m )在椭圆上,直线 OP 平分线段 AB ...