The traditional view is we sleep because our brain is “programmed” to make us do so. A. w

问题补充：

The traditional view is we sleep because our brain is “programmed” to make us do so.

A. when

B. why

C. whether

D. that

答案：

A. when

B. why

C. whether

(答案→)D. that

解析：本题考查表语从句的用法。考查表语从句的连词。从句意思完整，也不缺乏任何成分，所以用that。意思是：传统的观念认为我们之所以睡觉是因为大脑中设计好的程序让我们这样去做。