The passage focuses on ______.

A．Forests could not function without the fig wasp.
B．Forest will recover no matter what we do to them.
C．If man does not acquire an understanding of his relationship to the forest and other habitats there will be an ecological disaster.
D．Scientists' long-term contribution to the quality of life depends on their fig wasp research.

A．Some of the treats can be removed.
B．Young people play a minor role in tipping the police off some accidents.
C．It is found that the attacker is likely to tell his plan beforehand to his peer.
D．It is not difficult to make young people understand why it is in their interest to tattle.