为避免超高车辆闯入隧道造成事故，小欢设计了警示电路，使用时闭合开关S．导线EF横置于隧道口上沿前方，一旦被驶来的车辆撞断，红灯L亮且电动机转动放下栏杆．灯和电动机中，即使其中之一断路，另一个也能正常工作．下列电路中符合要求的是（   ）

根据表格内容，选择最佳答案。    How time flies! The 9th graders are going to graduate soon. We invite them to write about their school memories.
    Let's share some of them.             
—Ms. Rosen
Name: Brita
Favourite memory: Moving to this school last year and meeting new friends. Unpleasant memory: Being the “new girl”. Favourite teacher: Ms. Rosen. I like her interesting classes. Advice: School can be fun if you do your best.Name: Jay
Favourite memory: School trips. Singing competitions. Unpleasant memory: Project homework. Favourite teacher: Ms. Williams. She treats every student equally. Advice: Work hard and fun will come.Name: Rocky
Favourite memory: Meeting new friends. The weekends. Unpleasant memory: Tests. Favourite teacher: Mr. Taylor. He helps me with my lessons. Advice: Once you fall behind, keep trying till you catch up.Name: Angel
Favourite memory: Being with new people. Fun classes. Unpleasant memory: The loss of a new watch. Favourite teacher: Ms. Rosen. She helped me through hard times. Advice: Hard work brings success.

读一读。

材料一：中国科学工作者在喜马拉雅山发现海洋生物的化石。

材料二：在我国东部海底，人们发现了人类活动的遗迹。

材料三：欧洲的荷兰是世界著名的“低地国”，全国1/4的陆地低于海平面，但是国土面积在过去的百年中不断扩大。

一个圆柱体的底面直径和高都是10厘米，它的侧面积是____平方厘米，表面积是____平方厘米．

We can go skating in ____ (冬季).