学会归纳历史发展的阶段特征是历史学习的重要方法之一。请问辽、宋、夏、金时期最显著

阅读短文， 从方框中所给的四个句子中选出正确选项， 填在短文空缺处，使短文内容完整、连贯。

Do you have a mobile phone? Do you often send text messages（信息）to your friends of family? If you keep sending text messages over and over again, there may be something wrong with your fingers(手指). 小题1:  If you don’t , you may get hurt one day.
Text messaging or “texting” is becoming popular. But , scientists have found out that texting can give us problems with fingers. Too much texting can make your fingers uncomfortable. When we press small buttons over and over again , we may have a disease(疾病) called RSI. RSI is short for Repetitive Strain Injury(重复性力损伤).
Harriet Wilson is a doctor. She has many patients(病人) with RSI.小题2: If we spend more than 10-15 minutes every day, we could have such problems in the future.
Mobile phones and the buttons are getting smaller and smaller.  小题3: Texting with a smaller phone is worse than using a large phone with bigger buttons.小题4: . It’s easy to type with a large one.
If you use a computer keyboard and play video games for long, you may have the same problem. More and more people can find themselves with RSI.

It’s a good idea to use a large phone. Everybody using the mobile phones should be careful. The buttons are getting closer together. She says we should check how much time we are spending in typing text messages.

小题5:What does the writer want to tell us?

A．He wants to ask us not to send text messages with mobile phones.

B．He wants to tell us to uses small mobile phones to send text messages.

C．He wants to tell us some good ways to communicate with friends.

D．He wants to tell us the damage(损害) of sending text messages too much.