试题详情

Many linguists believe that evolution is（ ）for our ability to produce and use language.They claim that our highly evolved brain provides us with an innate language ability not found in lower organisms.

be responsible for是一固定搭配，意思是“成为……的原因；应归咎或归功于某事物”。如：Smoking is responsible for many cases of lung cancer.吸烟是许多人患肺癌的致病因素。A.reliable“可靠的”；C.available“可得到的，可达到的，可使用的”；D.accountable“对……负责的”。