According to the author, how would scientists comment on many of the things they consider important and

A．People in the countryside have to work harder to make a living~
B．The national social and economic progress will be hindered.
C．There will be a crisis between rural and urban residents.
D．Workers have to find other jobs beyond their regular one.

A．C-F-C’s are coolants for air-conditioners.
B．C-F-C’s arc easy to eliminate.
C．Farmers and shippers are usually using methyl bromide to kill insects.
D．Ozone layer will recover very soon as long as we stop using methyl bromide and C-F-C’s.