第三部分 阅读理解（共20小题；每小题2分，满分40分）
阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
Most American children eat potatoes every day, but they don't know which part of potato is most nourishing(有营养的).Take a sharp knife and cut a very thin slice(薄片) from it and hold it to the light, you will see that the potato has skin, an outside rim(边缘) and the inner part. The outside rim which is right under the skin is most nutritious(有营养).But this part is often thrown away with the skin. Even the skin itself is better for food than the inside. When eating a cooked potato, if you choose the inside and leave the outside, you are wasting the best part of it. If you can’t eat the whole potato, it is better to eat the outside rim and leave the inner part.
61. A potato has _____.
A. one part only   B. two parts   C. three parts   D. four parts
62. The best part of the potato is the _____.
A. middle          B. skin        C. outside rim   D. inside
63. In fact, the skin is _____.
A. no good at all                  B. better than the inside part
C. better than the outside rim     D. as good as the outside rim
64. What does this lesson tell about potatoes? It tells us _________.
A. how to cook them               B. how to cut potatoes
C. what is a potato made up of    D. how to eat them