题干
In recent years,American teens 【小题1】（earn） less than stellar（优秀的）scores on the national exam. A new analysis from the Center for American Progress argues for one simple step 【小题2】（help）raise these scores:Start school later in the day.
【小题3】（delay）start time by an hour across the country could improve students math scores up to eight 【小题4】（point）, the analysis says. That's almost one grade level of learning. The idea is that giving sleep-lacking teens more time to sleep 【小题5】 they hit the books will help them learn better.
In the previous study conducted in 2012 , middle school students 【小题6】 switched schedules to start school an hour later saw their test scores increase. And among them the low-performing students saw the 【小题7】（big）increase.
The Center for American Progress considered what would happen if those results 【小题8】（repeat） around the country.
“What we found is the impact 【小题9】 student achievement would be quite large,” Ulrich Boster, a senior fellow at the center, told The Huffington Post. “Starting school later could 【小题10】（significant）improve students' outcomes. ”
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