如图，AB是⊙O的直径，点D在AB的延长线上，DC切⊙O于点C，若∠A=25°，则∠D等于____ ．

    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.

今年2月起，我省各地打响了全民参与的剿灭劣V类水攻坚战，各级政府有“制”也有“智”，如实行“河长制”、实施《水环境保护条例》、采用水质检测仪等。对此，下列说法错误的是（  ）