第二題：Sugar intake is necessary for the body. However, consuming too much sugar can lead to weight gain, and it may also trigger mood swings or impair concentration.

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.

第二題：
Sugar intake is necessary for the body. However, consuming too much sugar can lead to weight gain, and it may also trigger mood swings or impair concentration.

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