________knowledge a man has，________it is for him to get a good job.

A．The more; more difficult

B．The more; the easier

C．The more; easier

D．The less; more difficult

均衡膳食是指-----------------------------------------------------------（    ）

A．能供应高能量的膳食

B．最易消化的膳食

C．必须含有水分的膳食

D．比例适中而又含有各种营养素的膳食