Although human evolution has in the past 10 000 years we are changing our environment f

问题补充：

Although human evolution has in the past 10,000 years, we are changing our environment faster still.

A. linked up

B. loaded up

C. sped up

D. split up

答案：

A. linked up

B. loaded up

(答案→)C. sped up

D. split up

解析： C本题考查动词短语辨析。句意：虽然人类进化在过去的一万年已经加快了，但我们正在更快地改变着我们的环境。link up联合，连接；load up装载货物；speed up加速；split up分组，分解，分离。