题目

用所给单词的适当形式填空 （1） My teacher told me “either” has two (pronounce). （2） Have you ever (be) to the Great Wall? （3） It's too hard (understand) the English movies. （4） He was afraid (speak) English in class. （5） Later on, I decided (take) lots of grammar notes in every class. （6） Can you drive more (quick), sir? The plane is taking off in an hour. （7） English can help us (understand) many new books and movies. （8） The manager chose the suitable project (wise) . 一个楔形物体B放在固定的斜面A上，B上表面成水平，在其上表面上放一光滑小球C，楔形物体从静止开始释放后沿斜面下滑，则小球在接下来的一小段时间内的运动轨迹是A. 沿斜面方向的直线 B. 竖直向下的直线 C. 无规则的曲线 D. 抛物线