China’s economic development has made ______ rapid progress in the past 20 years and young people have made ______ great contribution to this progress.

A． /; a

B． the; a

C． a; a

D． /; /

关于我国土地资源的叙述，正确的是

A．我国耕地、林地面积比重较大

B．我国对于草场的利用很合理

C．“人多地少”是我国的基本国情

D．我国难以利用的土地比重较小