题目

    All students need to have good study habits (习惯) . When you have good study habits, you can learn things quickly. You also remember (记得) them easily.    Do you like to study in the living - room? This is not a good place because it is usually too noisy. You need to study in a quiet (安静) place, like your bedroom. A quiet place will help you only think about one thing, and you will learn better.    Before you begin to study, do not forget to clean your desk. A good desk light is important, too. You'll feel tired easily if there is not enough light.1. When you have good s通常情况下，分子式C63H103O45N17S2的多肽化合物中最多含有多少肽键？ (　　) A．63　　     B．16　　     C．17　　　　 D．62