题目

—Why is it ________ so many people enjoy eating on the run? —Of course, the most obvious answer is that fast food is fast. A. that                     B. which                  C. what                    D. how 答案：A 解析: 本题考查特殊疑问句的强调用法，特殊疑问词why放在句首，即疑问词+is/was that….研究平抛运动，下面哪些做法可以减小实验误差（　　）A．使用密度大、体积小的钢球B．尽量减小钢球与斜槽间的摩擦C．实验时，让小球每次都从同一高度由静止开始滚下D．使斜槽末端的切线保持水平