读下图漫画，完成下列各题。

人血红蛋白由两条α链和两条β链构成。镰刀型细胞贫血症患者的β链第6位的谷氨酸替换为缬氨酸导致血红蛋白聚集为纤维状，红细胞形状随之改变。下列叙述错误的是

球的表面积与它的内接正方体的表面积之比是（  ）

   We usually have three meals. We have breakfast, lunch and supper. We often have more time for lunch and supper, and we eat a big lunch or supper. But a good breakfast is very important (重要的). It's easy for you to understand it. You don’t eat anything for about twelve hours from the last (上次) supper.
   One good breakfast should be rice or bread, an egg and milk. On a cold morning a cup of hot drink is necessary (必需的). Get up a little early and you can have enough time to eat breakfast. A good breakfast helps you to study well. It helps you to work well and play happily. You will be fun for a day after you enjoy a good breakfast.