The most important thing in providing first aid is to ______.

A．One should not apply first aid to the injured without knowing the ease 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.

A．be self-controlled
B．have others to assist him
C．have confidence in the sick person
D．get rid of the by-standers

A．other people's hesitation to offer first aid
B．unprofessional first aid
C．unnecessary first aid
D．unwise suggestion by by-standers