{#blank#}1{#/blank#} - {#blank#}2{#/blank#} = {#blank#}3{#/blank#} (枝)

What are the two speakers talking about?         

Comets(彗星) are parts of our solar system. Like the planets, they go around the sun.
But comets are not made of solid rocks like planets. A comet is a ball of dust, stones, and ice. Many people call comets dirty snowballs.
The "snowball"may be only a few miles across. But when the sun heats the "snowball,"much of it is changed to gases. The gases spread out and form the comet's head, which may be thousands of miles across.
A comet moves fast in its trip around the sun. But when we see it, the comet does not seem to move. That's because it is so far away. The moon moves fast, but when you look at it, you can't see any motion(运动). That's because the moon is far away.
Each year astronomers(天文学家) discover new comets. Some of them are seen only once. They make one trip around the sun and then go away out into space. The sun's gravity cannot hold them.
Other comets, like Halley, keep returning. They have been captured by the sun. Halley's earliest visit was probably 3,000 years ago. It may keep returning for another 3,000 years.
But every time a comet goes around the sun, the comet loses part of itself. Gases and dust are pulled out of the comet. That's why Halley is now dimmer（暗淡的） than it used to be. Next time it visits us, in 2062, it may be even dimmer. Each visit it may get dimmer and dimmer, until it finally disappears.

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下短文。短文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在此符号下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

       2）只允许修改10处，多者（从第11处起）不计分。

    China's higher education is developing very fast.The number of college students are quite small in the 1980s, now nearly fourteen million students are studying in colleges and universities.

    Why does China's higher education develop such quickly? Several factors contribute to it. First of all, its quick development results China's rapid socially and economic development.Through the reform and opening up, people have become richer and have much money to invest in education. Secondly, our government had attached great importance to higher education and taken out practical measures to encourage people to go to college. Beside, with the development of society, more and more people hope to receiving higher education.

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下短文。短文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在此符号下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

       2）只允许修改10处，多者（从第11处起）不计分。

    China's higher education is developing very fast.The number of college students are quite small in the 1980s, now nearly fourteen million students are studying in colleges and universities.

    Why does China's higher education develop such quickly? Several factors contribute to it. First of all, its quick development results China's rapid socially and economic development.Through the reform and opening up, people have become richer and have much money to invest in education. Secondly, our government had attached great importance to higher education and taken out practical measures to encourage people to go to college. Beside, with the development of society, more and more people hope to receiving higher education.