四、閱讀測驗題 (15題，每題1分，共15分。)    Instead of giving children answers directly, saying, “Let’s find out the answers together,” may be the best way to introduce some scientific ideas to them and help them develop the ability to solve problems. Take the experiment “Magic Finger” for example. First, prepare a bowl of water and put some black pepper into it. Then ask your children to put their clean finger into the water. They will notice the finger covered with black pepper while taking it out. Next, ask them to do it again but this time they have to rub the finger with a bar of soap first and place it back to the water. They would be amazed to find that the black pepper doesn’t stick to the finger but goes away from the finger. Why is that? It’s because soap can break the surface tension (表面張力) of water. Water molecules (分子) are first bound together, but soap makes them become less close. That is, soap lowers the surface tension of the water, making it possible to remove the stains from skin or clothes.
【題組】36. The passage is most likely taken from a _______.
(A)history book
(B)parenting magazine
(C)newspaper ad
(D)class schedule