题目

Choose the words or expressions and complete the passageExam time is the most stressful (最有压力的) period of the year. You've worked all the term on your classes and now it's the time to prove what you have learned. With so much at stake, it is easy to get stressed about your exams. However, with the right amount or hard work and focus you can pass your tests    1!When I was in school, I used to get very stressed over my examinations. So did my friends. Some people stopped eating and others ate too much! Some     2 and others burned themselves out! The most important thing to rem如图，质量为M的物体内有光滑圆形轨道，现有一质量为m的小滑块沿该圆形轨道在竖直面内作圆周运动。A、C点为圆周的最高点和最低点，B、D点是与圆心O同一水平线上的点。小滑块运动时，物体M在地面上静止不动，则物体M对地面的压力N和地面对M的摩擦力有关说法正确的是（     ）A.小滑块在A点时，N＞Mg，摩擦力方向向左B.小滑块在B点时，N＝Mg，摩擦力方向向右C.小滑块在C点时，N＝（M＋m）g，M与地面无摩擦D.小滑块在D点时，N＝（M＋m）g，摩擦力方向向左