填空题

How long does a person have to stay indoors after applying sunscreen ____________________.

【参考答案】

15-30 minutes。
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填空题
What is the first advertisement mainly aboutIt is mainly about ____________________.
问答题
Walking is the easiest and simplest form of exercise. By putting one foot in front of the other, you can start to walk your ways towards a healthier lifestyle. Walking is an easy way to challenge the cardiovascular system (心血管系统), while at the same time building muscles. Walking actually bums as many calories(热量) as running the same distance--if done in the correct manner.
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