The role of the body clock is to
A. enable us to sleep 6 hours a day.
B. help us adapt to a 24-hour cycle.
C. regulate the body's functions.
D. interfere with the body's functions.
以下关于极限编程（XP）和原型法区别的描述中，错误的是（）。
A. 两者都适用于用户需求不是非常明确，易发生变化的项目
B. 极限编程(X通过“小型发布”策略获取需求后，将毫不犹豫的抛弃每个“小版本”
C. 原型法要求原型要完整，覆盖到整个项目的各功能点
D. 极限编程(X对每一个“小版本”都有很高的质量要求
Sounds can be called a language only when they have a structure and a grammar.
A. Right
B. Wrong
C. Not mentioned
It can be seen from the last two paragraphs that
A. you can control your own body clock.
B. it is not difficult to adjust to a new time zone.
C. adjusting your watch can help you avoid jet lag.
D. there isn't much you can do to avoid jet lag.
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