“The Twenty-Four Solar Terms” is known as the 5th great invention from ancient China. As the 18th solar term, Oct. 23 marks the     1     (begin) of the Frost’s Descent also called “Shuangjiang” in Chinese.

The solar term Shuangjiang     2     (mean) the time of year when frost starts to sweep across China. In autumn, as the weather gets cool and cold, the temperatures fall so fast     3     little water drops in the air become icy in the end, bringing deadly cold winds as well. It     4     (think) as autumn’s last chapter and the start of the following winter.

The Frost’s Descent, with clear autumn skies and refreshing air, is an excellent time     5     (go) hiking and catch the sights from high up in the mountains. Many Chinese believe that it is a good idea to go walking in the highlands and enjoy the     6     (beautiful) of nature on that day.

During this bright period, Chinese people also enjoy chrysanthemums (菊花), a kind of autumn flowers, which come out in late autumn and are known     7     the “flower of long life”.

Eating orange-colored persimmons (柿子) is another traditional Chinese custom. The Chinese think these orange fruits not only keep out the cold, but also provide the human body     8     rich VC. In order to fight off different winter illness, people usually prefer the helpful things.     9     (actual), eating some persimmons in autumn is good for people of all ages, as ancient Chinese medical books recorded.

Shuangjiang, as the last solar term of autumn, is an end as well as a start for Chinese people to work for a happier and     10     (health) life, surely.

Time     1     (fly) when you play on your smartphone. But when you get down to the real business of work and study, one hour feels like a year. Why are we so attracted by smartphones but easily bored     2     studying?

It all bolls down to something small and hard to see: dopamine (多巴胺). Dopamine is a “pleasure chemical” that makes people feel good. Our brains give it out when we eat yummy food, after we exercise or when we get a prize.

Compared with studying, playing on smartphones causes our brains to give out more dopamine. For example, checking your phone for a text leads to a 400 percent increase in dopamine. But why?

When we visit social media, we don’t know what we’ll see next     3     who will give opinions about things we post (发布) . This “mogic of maybe” makes the dopanine system active. We get excited wondering if we have messages from our friends. When our expectations (期待) are met, dopamnine is     4     (give) out,

And to find more dopamine, we continue checking our phones. Studying doesn’t provide such magic.     5     this excitement, we get bored much more easily.

Can we do something to change that? According to scientists, apps can become less     6     (attract) if we turn off notificationis (通知) or change the screen colors to black and white. We can also set time limits on apps to avoid     7     (use) them too much.

“As for studying, you could check your progress     8     (day) or weekly and reward yourself for it,” said Daniel Wong, writer of The Happy Student. “You could also search for interesting topics connected with your textbook. Use what you’ve learned to make an     9     (influent) in the real world. This will make knowledge much more interesting     10     (learn).

Red is the color of China. Among all the colors, red is most e_________seen. The color red is fresh and pure, and in China we call it China Red. Chinese people are attracted by the color red not only because it m_________ people excited, but also because it has rich meaning in Chinese culture and h__________.

No country in the world has ever used a color in s_______ a way as China. Here, red is a symbol. It gives color to the soul（灵魂）of the nation. Finding red-colored things in China is very easy, as you can see the color e________. About traditional red thing have been playing special role in China, the walls of ancient palaces, the national flag, lanterns, t___________ paper-cuts, and even red tanghulu.

Red is the color of the luck, health, h__________, peace, richness and so on .Only red things and events can fully s_______ and explain its beauty . The color can be alive and meaningful only when it’s connected with people.

In China, red is m______ than just a color. It carries the ancient history and culture of the Chinese nation. China Red is filled w_____ mysterious charm beyond description and it is right here in China waiting for you to feel and discover!