Questions 19 to 22 are based on the conversation you have just heard.

A. She sold all her furniture before she moved house.
B. She still keeps some old furniture in her new house.
C. She plans to put all her old furniture in the basement.
D. She bought a new set of furniture from Italy last month.

A. To encourage rats to drink vitamin-enriched water.
B. To find out rats’ preference in flavor.
C. To test whether rats know which drink is good for them.
D. To demonstrate that vitamins are tasteless.