W: How much is this T-shirt
M: Six dollars for one, but you can save two dollars if you buy two.

How much should the woman pay if she buys two T-shirts（）

A. the family where the parents are divorced
B. the family which is in poor condition
C. the family where the children are less educated
D. all of the above

A. The sick can be removed quickly and safely.
B. The computer gives the medical information.
C. It helps the firefighters take special care to find the sick.
D. It has numerous ways of helping them with their problems.