----Sorry, Michelle is a little shy. ----Never mind, I be that way when I was her age. A. would, at B. used to, × C.would, × D. used to, at
如右图所示，△ABC 中， AB=AC，过AC上一点作DE⊥AC，EF⊥BC，若∠BDE=130°，则∠DEF=（ ▲ ）A、60° B、65° C、70° D、75°
Napoleon’s story proves that to be a hero has nothing to do with size, with a smart mind and a brave heart. A．and B．so C．or
贫血主要导致血液A． 运输氧气的能力降低 B. 运输营养物质的能力降低C． 运输无机盐的能力降低 D. 运输含氮废物的能力降低
“其实胸中之竹并不是眼中之竹也，因而磨墨展纸，落笔倏作变相，手中之竹又不是胸中之竹也。”郑板桥的这句话蕴含的道理是（ ） A.意识活动具
已知向量，动点到定直线的距离等于，并且满足，其中为坐标原点，为非负实数. （1）求动点的轨迹方程； （2）若将曲线向左平移一个单位，得曲线，
向某AgNO3溶液中加入一定量Zn、Cu混合粉末，充分反应后过滤，得到滤渣A和蓝色滤液B；再向B中加入一定量Zn粉充分反应后过滤，得到滤渣C和滤液D。取滤
During the Second World War ,the story happened. An old man lived in a small town of Germany. He had three sons and they all worked in the same factory where he had worked. After the war had begun,
