C. can’t pay for their living expenses themselves

　　D. should live a happy life in their late years

　　7. What kind of people are Dart’s grandparents?

　　A. They love Dart more than themselves.

　　B. They are living a very poor life.

　　C. They don’t know how to enjoy life.

　　D. They like to go to kinds of social gatherings.

　　C 难度：★★★★

　　Shortening the school week to four days has a positive impact on elementary school students’ academic performance in mathematics, according to researchers at Georgia State University and Montana State University. The study analyzed the impact of a four-day school week on students’ achievement by comparing fourth-grade reading and fifth-grade math test scores from the Colorado Student Assessment Program (CSAP) for students who participated in a four-day school week, versus (与……相对) those who attended a traditional five-day school week.

　　The researchers found a four-day school week had a statistically significant impact on math scores for fifth-grade students, while reading scores were not affected. The study suggests there is little evidence that moving to a four-day week hurts students’ academic achievement, an important finding for U.S. schools seeking ways to cut costs without hurting students’ achievement.

　　揥e thought that especially for the younger, elementary school kids, longer days on a shorterl school week would hurt their academic performance because their attention spans (持续的时间) are shorter. Also, a longer weekend would give them more opportunity to forget what they had learned,” researcher Mary Beth Walker said.

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