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

   A. when    B. why    C. whether      D. that

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

A. when            B. why              C. whether              D. that

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

A. when        B. why       C. whether              D. that

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

A. when

B. why

C. whether

D. that

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

A. when            B. why              C. whether              D. that

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

A．when

B．why

C．whether

D．that

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

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

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

   A. when       B. why           C. whether       D. that

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

A. when                         B. why                         C. whether                   D. that