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A. It is related to 91 percent of mental illnesses.
B. It ranks as the fourth biggest cause of death.
C. It causes more harm to teens than older people.
D. It causes more harm to people living in the city.

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Questions 4 to 6 are based on the passages you have just heard.

A. The combat against environmental pollution.
B. Problems caused by artificial lights.
C. Technical improvements of LED lights.
D. The importance of darkness to the ecosystem.

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Artificial lights can secure people’s safety in cities.
B. Lights make the view of universities more beautiful.
C. LED lights tend to use less energy than other lights.
D. Artificial lights in the city endanger people’s health.

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Listen to the recording

A. They can help reshape ecosystem.
B. They are comparatively more expensive.
C. They are vastly deployed in 16 countries.
D. They are a major source of light pollution.

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Questions 7 to 8 are based on the passages you have just heard.

A new technology to produce clean energy.
B. A new idea on ecosystem improvement.
C. A new chemical to better utilize sunlight.
D. A new method to ease global warming.

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Listen to the recording

A. It is related to 91 percent of mental illnesses. B. It ranks as the fourth biggest cause of death. C. It causes more harm to teens than older people. D. It causes more harm to people living in the city.

Questions 4 to 6 are based on the passages you have just heard.

Listen to the recording

Listen to the recording

Questions 7 to 8 are based on the passages you have just heard.

A. It is related to 91 percent of mental illnesses.
B. It ranks as the fourth biggest cause of death.
C. It causes more harm to teens than older people.
D. It causes more harm to people living in the city.