题目

如图所示，蜘蛛在地面与竖直墙壁之间结网，蛛丝AB与水平地面之间的夹角为37°，A点到地面的距离为1m，已知重力加速度g取10m/s2，空气阻力不计，若蜘蛛从竖直墙上距地面0.8 m的C点以水平速度v0跳出，要到达蛛丝，水平速度v0至少为（     ） A. m/s   B.  m/s     C.  m/s     D. m/s 答案：C请根据所给首字母或中文提示 ，写出单词在句中的正确形式。 1. How m______ apples do you have? 2. The p______ of the book is 25 yuan. 3. Liu Dehua is one of my favourite s______. 4. My friends Linda likes drinking j______. 5. The blue whale is the largest a______ in the world.6. We ______ (吃) lunch at half past eleven.7. Please ______ (打印) the document, Wei Hua. 8. I like that book, ______ (也). 9. My mother is a ______ (医生) at the hospital. 10. —Where's the gym?       —It's in a ______ (建筑物) in front of the office.