阅读理解。

     The best known vegetable in the world is the potato. It grows in many places and does not need rich

soil like many other crops. But until four hundred years ago the potato was not known to the Europeans.

But today it's one of the main foods in Europe. About half of the world's potatoes are grown in Europe.

      In France the potato was not grown for a long time. Here is a 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 thmesleves.

根据短文内容判断对错。

( )1. Potatoes are grown and eaten in Europe.

(     )2. The potatoes are grown only in the rich soil.

(     )3. Louis was the first man to eat the potato.

(     )4. At first the Europeans grew potatoes to eat.

(     )5. Louis liked the potato flowers better than the potatoes.

不良修复体、不良的正畸治疗等有促进牙石的致病作用。