题目

A group of boys from a primary school soccer team in Anshun, Guizhou Province, are doing daily training on the playground. The team was made 1 their P. E. teacher Mr. Zeng. And their headmaster Mr. Xiong also 2 a lot. Although the members practice 2 hours every day, playing soccer does not 3 their studies or farm work. Most of these boys’ parents work in big cities far from the village. In the past, they were afraid of showing themselves in public, 4 now through soccer, they have become outgoing, active and brave. And their skills in soccer have improved rapidly by working hard. In a sho 下图所示,平行直线表示电场线,但未标方向,带电为+10-2 C的微粒在电场中只受电场力作用,由A点移到B点,动能损失0.1 J,若A点的电势为-10 V,则 ①B点的电势为10 V ②电场线方向从右向左 ③微粒的运动轨迹可能是轨迹1 ④微粒的运动轨迹可能是轨迹2 以上正确的是: A. ①③ B. ②④ C. ②③ D. ①④
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