Income from duty—flee airport shops is growing three times faster than in the high street.（）

A. their academic performance will affect their future careers
B. they are heavily involved in student affairs
C. they have to run for positions of authority
D. they have to attend a lot of classes

A. One should not apply first aid to the injured knowing the cause of the accident.
B. It is easy to carry out first aid if one has the necessary facilities.
C. First aid is an important part of the whole treatment.
D. First aid may not be effective before a doctor or expert comes.