单选题 Which of he following is the way that a computer does its processing?

A、 Recognition and computation separately.
B、 Recognition and computation simultaneously.
C、 Computation followed by checking.
D、 Recognition, reasoning and then computation.

【正确答案】 A

【答案解析】[解析] 本题考查细节理解。参看第三段第六句中的“recognition and computation are performed one at a time．”这里的one at a time和选项 [A]中的separately完全吻合，和选项[B]中的simultaneously(=at the same time)相反。本段第八句中的simultaneously指的是人脑工作程序。因此，选项[A]为正确答案。