图中描述的是远视眼的成像情况，请在方框内画出可以矫正视力的透镜．

炎热的夏天，特别是黎明时分，池塘里的鱼大量浮到水面（即“浮头”），严重时还造成鱼群大量死亡（即“泛塘”）．这是由于水中缺____．

    Do you w____your own blog(博客)？Do you often r____others' blogs on the Internet?

All ____ the world, not only famous people but also many students use b____ to share their e____ and ask for advice or help. "It's a good way to ____ my life to the world, "a student says. She has had her blog f____ eight months. Students like ____(write) blogs. O____you start to write your blog, you will find that you o____up a new world. But what you write down may trouble you sometimes. So, use the blog carefully so that you can keep yourself away from some trouble. The blog makes everybody's life colorful.