先通读下面的短文，掌握其大意，然后从A、B、C、D四个选项中选择可以填入空白处的最佳答案。
    Carole worried a lot about her weight(体重).She was a little too large,and she  1 that's all because she ate too much junk food.When Carole felt2 ， she loved to eat junk food to make herself feel better.Chocolates and cookies were her favorites.But when her stomach felt very full, she3wanted to eat.It was clear that she had no control over both food and bad feelings.Carole's parents were quite worried about Carole.They took4to see a doctor.The doctor didn' t think Carole was sick.He just told her some5 of developing better self-control(自制力).
    According to the doctor ,using6 for comfort (慰藉) is not always a bad thing.7if the first thing one wants to do is open his fridge(冰箱)whenever he is upset，it can be a problem.He asked Carole to try hard to8the habit of eating for comfort.He advised her to do9else to have fun，like talking to someone on the phone or going out with Mends when she felt unhappy.
    Carole felt the doctor's advice was really10.When she left.she was sure she would soon make a change!

已知，如图长方形ABCD中，AB=3cm，AD=9cm，将此长方形折叠，使点B与D重合，折痕为EF，则BE的长为（　　）

如图所示，图甲为热敏电阻的R﹣t图象，图乙为用此热敏电阻R和继电器组成的一个简单恒温箱温控电路，继电器线圈的电阻为150Ω．当线圈中的电流大于或等于20mA时，继电器的衔铁被吸合．为继电器线圈供电的电池的电动势E=6V，内阻可以不计．图中的“电源”是恒温箱加热器的电源．

①应该把恒温箱内的加热器接在____（填“A、B端”或“C、D端”）．

②如果要使恒温箱内的温度保持100℃，可变电阻R'的值应调节为____Ω．

③为使恒温箱内的温度保持在更高的数值，可变电阻R'的值应____（填“增大”或“减小”）．

（1）不能用手直接拿取金属钠，其理由是 ____

（2）盛放碱液的试剂瓶不能用玻璃塞，其理由是 ____

（3）做馒头时，往往要在发酵的面团里加入小苏打，其原理是： ____

     杨老师带了418元去买体育用品。小篮球 10元/个，他想买45个小篮球，还差多少元？