【题目】School kids have always complained about having tons of homework. A study offers ways to reduce the load (负荷).children are carrying to avoid hurting young shoulders and backs.

Children generally carry about 22 percent of their body weight in backpacks—for a teenager, that can reach more than 30 pounds of books, food, calculators, and other necessities of modern life. When that amount of pressure is placed on one or two narrow shoulder straps (带子), the weight can easily reduce blood flow to kids’ skin and muscles (肌肉).

Even at 10 percent of body weight, the pressures were still high, and that hasn’t been measured before,’’ said Brandon Macias. According to the study, the pressures were measured when the packs were loaded with 10 percent of the students’ body weight, then 20 percent, and finally 30 percent. An unusual finding came to light—even when both straps were used, pressure on the students’ shoulders was uneven (不平均的). It seems like the right shoulder becomes loaded more, which over a period of years may cause back pain.

The research team came up with the following advice based on its study. The backpack should be positioned (放置) high on the back, reducing the stress on the shoulders and back. And backpack straps should be positioned over both shoulders, lowering the amount of weight carried by one shoulder. Wider straps also reduce the pressure on the shoulders. And finally, the weight in backpacks should be reduced.

1The study mentioned above was carried out for the purpose of ________.

A. helping kids grow taller

B. improving students’ grades

C. reducing kids’ chances of having back pain

D. helping students with pressure in their studies

2Which of the following statements about the students’ backpacks is right?

A. The bag with one shoulder strap is more suitable for students.

B. The weight of the backpack should be 22% of their body weight.

C. The two straps of a bag don’t share the same weight from a bag.

D. Students usually carry a bag about 10 percent of their body weight

3The underlined phrase “came to light” in Paragraph 3 means “________”.

A. was changed B. was tested

C. was impossible D. was known

4The following are suggested by the research team EXCEPT ________.

A. using wider straps

B. reducing the weight of the school bags

C. positioning the school bags high on the back

D. using more than one bag for kids, school things

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