These teenagers don’t know much of the world yet; that’s why they are so easily .A. taken

问题补充：

These teenagers don’t know much of the world yet; that’s why they are so easily .

A. taken in

B. taken on

C. taken up

D. taken over

答案：

(答案→)A. taken in

B. taken on

C. taken up

D. taken over

解析：考查短语辨析。taken in 欺骗，taken on 呈现，taken up 从事，taken over 接管，句意：这些青少年对世界了解的还不够多；那就是他们如此容易被欺骗的原因。所以选A。