It is not clear exactly why spending more time outside would benefit children’s eyesight, the researchers said. However, some research has suggested that the higher levels of light intensity found outdoors may increase the release of the chemical dopamine (多巴胺) of the eye. In turn, dopamine is known to restrain the type of growth in the eye that is associated with nearsightedness.

　　Based on the new results, the researchers recommend that children spend more time outdoors because of the potential benefits of their eyesight. However, it’s important to protect kids’ skin and eyes from UV(紫外的) light, which can be damaging.

　　28. What did the children in the intervention group do during each school day?

　　A. Attend an extra class of outdoor activities.

　　B. Continue to do their usual activities.

　　C. Spend one hour in doing eye exercises.

　　D. Participate in outdoor activities with parents.

　　29. What can be inferred about the chemical dopamine?

　　A. It can contribute to poor sight.

　　B. It can damage people’s brain.

　　C. It is beneficial to eyesight.

　　D. It means low levels of light intensity.

　　30. What may be discussed in the following paragraph?

　　A. How to design outdoor activities for kids.

　　B. How to prevent kids becoming nearsighted.

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