单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now listen to the passage.

What are drug addicts concerned with

A.They are concerned with their financial situations.
B.They are concerned with their declining health.
C.They are concerned with how to get fid of drugs.
D.They are concerned with how to get drugs.