20元正好可以买下面哪两种物品?列加法算式表示。

阅读理解。
    Imagine the first days in a new time zone. Slow to respond to the 1, your body clock is confused. You’re sleepy all day, but when it's time for bed, you can hardly fall asleep. Obviously you are2jet lag（时差反应）.

    Travelers have traditionally fought this 3 with sleeping pills or alcohol. There are actually healthier ways that can work just as 4.

    For example, the moment you get on the airplane, start 5 your biological block to the destination's time. If it's daytime in your destination, try to stay 6 . Walking around the cabin（客舱） can be of help. When it’s nighttime, try to sleep. In that case, eat before the flight, 7 an empty stomach will prevent you from sleeping. These tips will help you start a new 8of sleep and wakefulness.

是故明君制民之产，必____，____；____，____；然后驱而之善，故民之从之也轻。（孟子《齐桓晋文之事》）

要点：1. .我家乡过去是一个安静的地方，四周青山环绕，空气新鲜
2. 最近，我家乡已经发生了很大的变化。高楼大厦随处可见。
3. 人们乘公交车去城市更快更容易。很多人买了私家车。
4. 但是，这些变化也给我们带来了许多麻烦，例如 ：……
5. 我希望我的家乡将来会变得越来越美丽。
注意：1.所写短文必须包括以上内容，自由发挥的内容必须围绕主题；
2.词数80个左右，第四要点须用1-2句话作适当发挥
The changes to my hometown