Most high schools begin their day at around 7:30 a.m., which leaves many teenagers nodding off in the
morning. In fact, at least 20 percent of high school students 39 in class on a typical day. The problem:
teenagers need a lot of 40 —about nine hours each night, experts say. And most of them aren’t getting
enough.
To help sleepy teens, some school districts have tried 41 the opening of the high school day. Kyla Wahlstrom,
an educational researcher, has been following school districts that changed their 42 . One district changed its start
time from 7:20 a.m. to 8:40 a.m., and Wahlstrom says the students have benefited from the change.
【題組】40 (A) attention (B) discipline (C) exercise (D) sleep
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