本文明写花，暗写人。借黄杜鹃赞颂社会中哪些人？借紫杜鹃、白杜鹃鞭笞社会上的哪些人？

    My name is Sam. I am a junior high school student. My school is close to my home, so I always go to school on foot. Classes start at 8 a.m., and I am seldom late. I like Geography best. I enjoy learning about different places in the world.

    In the morning, we usually study Chinese, Maths and English. We have our morning break at 9:50 a.m..  When the bell rings, I run to the playground with my best friends Tom and Jack. We often play games. Break ends at 10:10 a.m..

Lunch is from 11:50 a.m. to 12:30 p.m.. Afternoon classes end at 3:30 p.m. Then Tom, Jack and I take part in the school bank practice. We make great music together.

    I always have a good time at school.

质量为0.2千克的水温升高50℃，求水吸收的热量Q_吸．C水=4.2×10³J/（kg•℃）．