圆柱的体积等于和它等底等高的圆锥体积的3倍．（判断对错）

注意：1）词数：120左右，短文的开头己为你写好，不计入总词数。

2）短文需包括表中所有要点，内容可适当发挥，以使行文连贯。

3）参考词汇：成绩差的学生：a slower student

Dear Mr. Zhang,

    We have held a discussion about whether it is good or not for a top student to share a desk with a slower student

    Good habits are important to us. We should build good living habits. Now let's have a look at the two brothers. Li Qiang and Li Gang are brothers. But their living habits are different. Now let's go to Li Qiang's room. Li Qiang cleans his bedroom every day and puts his things away. Look! There is a computer on the desk. There are two balls under the bed. A guitar and a kite are on the wall. Some books are on the shelf. So he must be a careful boy. Now let's go to Li Gang's room. The room is not clean. Can we see his clothes on the desk? Oh, yes. We can see a football and a knife on the desk, too. Li Gang never does any cleaning on weekends. So his room is in a mess.

    What do you think of Li Qiang and Li Gang? Li Qiang is a good boy. Li Gang must learn from his brother