1-C. New research on sleep indicates that reducing our hours of sleep is not only unhealthy, but can shorten our life span, too.New research on sleep indicates that reducing our hours of sleep is not only unhealthy, but can shorten our life span, too.
2-C. Waiting in line has been the subject of careful studies, and various measures have been taken to shorten waiting time.Waiting in line has been the subject of careful studies, and various measures have been taken to shorten waiting time.