The ideas that he came up with worked out f____. He now has 16bikes fixed up and gives to children who don't have bikes.

如图所示为中国科技馆静电滚球装置．当快速转动转轮时，可以使玻璃罩内位于圆盘中心处的那个大金属半球带上正电荷成为高压正极，圆盘四周成为环形的接地高压负极．罩内台面上的这些用金属箔包裹的小球在高压电极的作用下，其电荷从新分布，靠近正极的一侧带负电荷，靠近负极的一侧带等量正电荷，小球就会在电场力的作用下向电极移动，某个与正极碰撞的小球会因此带上正电荷而与正极分开，向着负极撞去；碰上负极后，负极立即中和其正电荷，又因其带上负电荷而与负极分开，向着正极撞去，如此循环往复便形成了有趣的静电滚球．请根据上述实验现象，提出一个可以探究的科学问题：____．

完形填空

    One night last February, seventeen-year-old Duffy drove home1 a winding road, he saw a 2light thrown against the tree. “I knew it wasn't the moon”, he said. “I drive this road 3and I notice little things 4”

    Duffy stopped his car and got out to 5Below him far down in the deep valley 6a broken car with its headlights on. Thirty minutes 7a man had driven off the edge of the road, which has no guardrail（护栏）. His car fell and8over, landing on its top more than two hundred feet 9

    Duffy 10to call for help, then returned and got down to reach the 11driver. Snow covered the valley and the temperature was below 12After struggling back up the cliff（悬岸）, Duffy 13his jacket and shirt and wrapped the injured man in time, along with the blankets from his 14.

   15deeds are starting to become16action for Duffy, the oldest of seven children. When he was 12, he17his ten-year-old brother from drowning（溺水）. Two years ago, his three-year-old sister 18rat poison（毒药）, and Duffy cleaned out her mouth, made her drink milk to protect her 19and called doctors.

    “We have tried to teach the children good 20and it looks like we have got some reward for it,” his father says.

在遥感技术中，可以根据植物的反射波谱特征判断植物的生长状况，读下图完成：不同的地物和地物的不同状况也有不同的反射，根据这一原理，可以利用遥感工作的有(   )

如图所示是水的循环示意图，请补充完成图中（1）____、（2）____（3）____三处所对应的物态变化名称及吸、放热情况．