A

    Hi! I'm Alan Miller．I'm an English boy．I'm 12．I'm in Grade Seven．My parents work in Tianjin now．My father is a teacher and my mother is a doctor．I have a brother, John．We are students in a middle school in Tianjin．He is 14 and he is in Grade Nine．We are in the same (相同的) bedroom．He puts his things in their right places，but my things are everywhere．

    Hello! My name is Zhou Wen．I am a Chinese girl．I'm 13．I'm a student of Grade Seven．Now I live in Beijing with my parents．My father is a doctor．My mother is a teacher．She teaches English in a school．My sister Zhou Xue is 3．She is with my grandparents．They are in Tianjin．My grandparents look after my sister．

根据材料内容选择最佳答案。

经测定，由甲醛(CH₂O)、醋酸(CH₃COOH)和丙酮(CH₃COCH₃)组成的混合物中，氢元素的质量分数为X％，则其混合物中氧元素的质量分数是（）

    Man has been interested in robots for quite some time. Scientists are always inventing new and good robots, which will play an important role in our future lives.

    ____

    They will take over jobs such as preparing meals, washing dishes, and sweeping the floor, so that we will have more free time to have fun.

    ____

    They will do all the heavy and dangerous work, and be put in hospitals, schools and offices.

    ____

    Whenever we feel sad, lonely or upset, we can have a chat with a robot. Robots will not only be good friends but they will also offer us good advice.

    In conclusion, robots will be more and more intelligent and will benefit us in many ways.

A. Robots will be our friends.

B. Robots will help us with our work.

C. Robots will be of help in doing housework.

D. Robots will replace humans in many ways.