第四題：Many people like to have some background music playing while they eat at home or when they dine at their favorite restaurants. Recent research indicates that both the type and loudness of music can noticeably influence the food choices we make.

第五題：Studies have found that indoor air quality is frequently worse than outdoor air, even for those living in highly polluted regions. This is caused by a range of factors, from cooking to cleaning activities. While poor indoor air quality is often associated with developing countries, it is actually an issue that affects people worldwide.

第四題：
Many people like to have some background music playing while they eat at home or when they dine at their favorite restaurants. Recent research indicates that both the type and loudness of music can noticeably influence the food choices we make.

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