Look! This is a picture. It is about Jenny's birthday. Her birthday is on May 25. On that day last year, she invited her friends to her house. Li Ming, Tom and I went to her house. We had a very good time. Before eating the birthday cake, we sang the birthday song for Jenny. She was very happy. And we were happy, too. After lunch, we went out to play in the park. We had fun all day.

如图所示，斜面体放置在粗糙的水平地面上，在水平向右的推力F作用下，物体A和斜面体B均保持静止．若减小推力F，物体A仍然静止在斜面上，则（   ）

关于荷兰圩田居民点的设置叙述正确的是（   ）