题目

过双曲线(a>0，b>0)的左焦点F1，作圆x2+y2=a2的切线交双曲线右支于点P，切点为T，PF1的中点M在第一象限，则以下正确的是 A. b-a=|MO|-|MT|                          B. b-a>|MO|-|MT| C. b-a<|MO|-|MT|                          D. b-a与|MO|-|MT|大小不定   答案：A 根据下列句子及所给汉语注释，写出空缺处各单词的正确形式，每空只写一词。 1. You should __________ (覆盖) the food with the cloth, or it will get dirty. 2. It’s reported that three _________(猴子) escaped from the local zoo last Friday. 3. I asked him to leave, but he ________(拒绝), so he still stayed there. 4.The boy _______ (伤) his leg while he was playing football. 5. The math problem is too difficult for me to work out _______(容易).