《三峡》作者用开头一段文字写童年时对“朝辞白帝彩云间”诗句的误解，这样写有何作用？

根据短文内容判断正误，正确的写正确，错误的写错误。

                                                                                                (C)

    The best-known (最熟知的) vegetable in the world is the potato. It grows in many places and does not need rich soil(土壤) like many other crops. But until four hundred years ago, the Europeans(欧洲人) began to know the potato. But today it's one of the main foods in Europe(欧洲). About half of the world's potatoes are grown in Europe.

    In France the potato was not grown for a long time .Here is story about Louis. In 1778 he saw some potato flowers for the first time .He liked them so much that he picked one and put it in his buttonhole. He was interested in the flowers not the potatoes themselves.

在我们日常生活中有许多不科学的说法，比如：①铁比棉花“重”；②将质量不同的物体分别放在已调平的天平两盘中，“重”的那端将下降．通过学习物理，我们知道：说法①中的“重”是指 ____大，说法②中的“重”是指 ____大．