单项选择题
A．aware of B．watchful for C．responsible for D．busy with
A．building the proper knowledge and habits in human beings B．safeguarding the forests from fire C．posting roles in forests D．holding the damage to minimum
A．holding the fire damages to a minimum B．people who have changed their attitude and behavior C．enough rue fighters with good fire-fighting devices D．carrying out experiments in "seeding" thunder clouds