题目

阅读下面短文，从短文后各题所给的A、B、C、和D四个选项中，选出可以填入空白处的最佳选项。 Eddie has lots of hobbies, but he loves baseball best. So it is his 1sport. Eddie plays baseball on a team every year in the spring. He loves to go to baseball2. Every day when it is3 Eddie's father throws a baseball to Eddie in the backyard. This is the time of day that Eddie 4best. He enjoys spending time with his father and he loves practicing baseball. Eddie 5baseball cards throughout the year. He and his father visit the 6and buy cards for Eddie's collection. Edd 在相互垂直的匀强磁场和匀强电场中，有一倾角为θ的足够长的光滑绝缘斜面，磁感应强度为B，方向水平向外，电场强度为E，方向竖直向上，有一质量为带电荷量为的小滑块静止在斜面顶端时对斜面的正压力恰好为零，如图所示。    (1)如果迅速把电场方向转为竖直向下，求小滑块能在斜面上连续滑行的最远距离L和所用时间；  (2)如果在距A端L／4远处的C点放入一个相同质量但不带电的小物体，当滑块从A点由静止下滑到C点时两物体相碰并黏在一起．求此黏合体在斜面上还能再滑行多长时间和距离．