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用如图所示装置研究“阻力对物体运动的影响”实验．（1）实验时，让小车从斜面同一高度滑下，目的是使小车到达平面时    ．（2）如图所示的三种情况，小车在   表面滑行时运动状态最容易改变．（3）结论：表面越光滑小车运动的距离越远，说明小车受到的阻力越    ， 速度减小得越    ．（4）推理：如果运动物体不受力，它将做    ．根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。 How to Get Your Child to Be Interested in Studies One of the skills you need to know as a parent is how to get your child to be interested in studies．Studying is the key to the academic and overall development of your child, but unfortunately, most children are not interested in studies．Your children will prefer to watch television, play video games and do many other things other than studying, affecting their academic performance．  66  Provide a print-rich environment．  67  You can also have a small bookshelf for children, fill it with children books and place it in your child's room or anywhere your child likes to relax．   68  It has been proven that children learn more from what others do than what they are told． __69  Read your books in your free time instead of watching movies or television, this will get your children interested in studies．They will always take books to read in their spare time instead of playing around． Reward their efforts． Children are motivated when their good actions are rewarded．When your children take steps to read, reward them with small gifts．Book gifts are the best gifts to give in this case． 70            Do all you can to get your children interested in studies: this is the path to success．           A．Be an example．           B．A good environment for studies is necessary．           C．Fill your home with all sorts of print materials ．           D．This is how to get your child interested in studies．           E．If you want to get your children to be interested in studies, read often．           F．Buy them puzzles and games that they can have fun with but be learning at the same time．           G．Congratulate them when their academic performance improves, take them to dinner or buy them lunch．