假如你叫李华，是一位成绩优秀的学生，你班班主任在安排座位时，让成绩好的学生和成绩差的学生作同桌，这在你们班成绩优秀的学生中引起了反响，大家就此进行了讨论。请以书信形式向报社编辑写封信，陈述学生讨论结果以及个人观点。

注意：1）.词数：100左右，短文的开头已为你写好，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

煤和石油等化石燃料对促进社会经济发展起到了重要的作用，这些燃料合理的综合利用是当前节能减排的要求。请回答下列问题：

    I come from Singapore. Singapore is a lovely country. It is small in size, but large in fun. Do you know Singapore is called the"Garden Country"? There are so many trees and flowers in my country.

Hainan chicken rice

    Hainan chicken rice is popular in Singapore. Do you know it came from Hainan in China? In the 1920s, a Chinese man named Mo Lurui came to Singapore from Hainan. He made chicken rice for a living. You can find Hainan chicken rice in most restaurants in Singapore.

The musical fountain(喷泉)

    The Fountain of Wealth in Singapore is one of the largest fountains in the world. It's a musical fountain. Usually, there are musical fountain shows at night. The water from the fountain can reach thirty metres high.

Good habits

    Singapore has different kinds of laws. People have good habits to keep our country clean. Chewing gum(口香糖)is not allowed(允许)in Singapore.

根据短文内容, 回答下列问题

动植物的生活离不开有机物，在细胞中分解有机物，释放能量的结构是（  ）

在显微镜下观察一滴河水，发现了一些能运动的绿色小颗粒．下列哪项不能作为判断这些小颗粒是生物的依据（  ）