下列关于昆虫的描述错误的是                                             

A．是种类最多的一类动物

B．有三对足，能爬行或飞行

C．是无脊椎动物中唯一会飞的动物

D．运动能力不强

Recently, to maintain national balance, the Chinese government has _____ a policy of encouraging college graduates to take positions in rural areas.

A．adapted

B．admired

C．adopted

D．admitted