16.A. Instead B. older C. difficult D. however E. exciting F. cause G. surprising |
A recent survey finds that a large number of American teenagers are not getting enough sleep, especially during the school week. The problem appears to get worse as they get (1)
.
On average, 6th-grades sleep 8.4 hours on a school night, and 12th-grades only 6.9 hours. The survey also says that not getting enough sleep can (2)
problems in a teen's life. Many teens fall asleep in school, so it is not (3)
that they get lower grades than those who do get enough sleep.
Nearly all teens have at least one electronic item, telephone, television, or computer in their bedrooms. Using them on a school night not only takes the teen's time away from homework, but also makes it (4)
for them to fall asleep. The survey suggests students avoid (避免) doing (5)
activities for an hour before bedtime. (6)
, use that hour to read for fun or take a warm shower.