4. B　从第二段可知，“未来行星”空间站玩具由太阳能电池提供动力。故答案选B。

　　5. D　从最后一段可推知，这种环保玩具目前所占的市场份额不大，但它的前景会很好的。

　　Ⅳ.1. Theme　2. being exposed　3. psychological disorders　4. Learning process　5. distraction/being distracted　6. Tips/Guidance/Suggestions/Advice　7. personal information　8. available online　9. Doing social networking/Social networking　10. Encourage

　　Ⅴ.One possible version：

　　Dear sister/brother，

　　How is everything?

　　As you know, it will be mom's birthday next Saturday. Dad and I had a discussion about how to celebrate her birthday yesterday.

　　Dad held the opinion that we should take mom to eat out, since we needn't do any preparation for it. But I suggested having a picnic in the park nearby. We family members can not only prepare it together but also have more time to chat and communicate with each other, which is beneficial to the harmonious family atmosphere. Besides, we can enjoy the beautiful scenery and breathe the fresh air outside. Also, mom needs some relaxation, since she has been devoting herself to the building of the family. Finally, Dad agreed with me and we are now doing some preparations.

　　If you are free this weekend, we are looking forward to your participation.

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