问题
选择题
According to scientists, our mental abilities begin to____ from the age of 27 after reaching the highest level at 22.
A．differ
B．shrink
C．fail
D．decline
答案
D
题目分析：考查动词辨析：句意：据科学家研究表明，我们大脑的能力在22岁左右达到最高，从27岁开始逐渐消退。A. differ不同，B. shrink 缩水，C. fail失败，失灵，D. decline 衰退，下降，吸引，选D。