The generation gap is so great in Hong Kong that the teenagers there rarely turn to their parents or teachers for advice on anything. Whether it be sex, AIDS, school worries or family problems, adults are not considered up to the job.
Until now, no one has asked Hong Kong youth, "What do you think" Some understanding of the emotions of Hong Kong’s youth, however, has come from the work of Dr. Jeffrey Days-at the University of Hong Kong. His survey of young people does not focus, for example, on how many drugs they take—but tries to answer the question why.
Dr. Day hopes the results, which he plans to explain in full next week, will reveal what troubles—as well as pleases—today’s high-school students. Conclusions will be passed on not only to government departments but back to the schools which took part.

气测录井是一种直接测定钻井液中（）含量的一种录井方法。

A.气体

B.可燃性气体

C.天然气

D.空气