Now the size of our town is _______ than it was ten years ago.

A．as twice large as

B．twice large than

C．twice as much as

D．twice as large as

有利于保护我国西北地区生态环境的行为是[ ]

A、经营管理粗放

B、超载放牧

C、盲目开垦

D、退耕还林还草