The chief reason for the population growth isn"t so much a rise in birth rates ______ a fail in death rates as a result of improvements in medical care.

A．more
B．less
C．least
D．most

A．He lives in a quiet spot far away from the town.
B．Our experience is far away from adequate and there are a few shortcomings in our work.
C．Competition can be healthy, but if it is pushed too far it can result in bullying.
D．By far the most important issue for them is unemployment.