B
Good news for everyone! We have a variety of robotsson sale in our store. They can help you a great deal in your life. Would you like to take a look? There is always one that you need and like.

()4. Which of the robots is the most expensive?
A. Study Robot.
B. Music Robot.
C. Time Robot.
D. Housework Robot.
()5. How much should you pay if you want to buy two robots to help with study?
A. ￥798.
B. ￥698.
C. ￥498.
D. ￥398.
()6. Which robot does a housewife need most?
A. Study Robot.
B. Music Robot.
C. Time Robot.
D. Housework Robot.
()7. Which of the following is true?
A. The four robots can all answer people’s questions.
B. The four robots are made in different cities of China.
C. For your grandparents, Study Robot is the most useful.
D. The price of Time Robot is higher than that of Music Robot.

4. D
5. A
6. D
7. B