题目

下列说法正确的是（  ）A．曲线运动的物体的速度方向不是物体的运动方向；B．曲线运动物体在某点的速度方向即为该点的切线方向；C． 曲线运动的速度大小可以变化，但速度方向一定不改变；D．速率大小不变的曲线运动是匀速运动．  答案：B解析:根据曲线运动的性质，曲线运动的物体在某点的速度方向即为该点的切线方向，A错误、B正确；曲线运动的物体受力方向一定与物体的速度方向有一定的夹角，故曲线运动的速度大小可以不改变，但速度方向一定变化，C错误；速度是矢量，大小不变，但方向变化，是变速运动，D错误。 阅读下面短文，根据所给情节进行续写，使之构成一个完整的故事。The eight-year-old Carol lived with her father David, Mother May and elder brother Rob. The little family happily lived in a beautiful village surrounded with beautiful nature. The village was at the foot of a mountain, with beautiful views of the snowy mountain. The family survived on growing seasonal plants and trees. Their life is totally surrounded by nature and beauty.While they lived a very happy life, Carol did not love the beautiful atmosphere of the village. She really wanted to move into the city and enjoy the city life. She wanted to shop, move around the city, watch movies, and eat in fantastic restaurants and cafes, etc.However, there was hardly any chance that Carol’s family moved to the city as they had everything in the village.One day, Carol fell asleep during the early noon and she had a sound sleep. Of course, she had a strange dream. She saw her grandmother in her dream as a fairy and her deceased grandmother granted her a wish. Carol requested her that she should love to enjoy the city life as she always desired.Grandmother understood the desire of Carol, but still wanted to convince her that the peaceful village life is better than the city life.She told Carol, “Baby, you cannot have access to fresh fruits and vegetables from plants as you have at your home. You cannot breathe fresh air. You cannot play with animals. You can hardly find any trees. You will not find peace as you see here! Do you still want to go to the city?”Without hearing the concerns, Carol asked her grandmother to grant the wish. Grandmother granted her wish, but with a condition. Carol was told that she would only have 6 hours to spend in the city. Later, she would return to the village. Carol agreed.注意:1. 所续写短文的词数应为 150 左右；2. 至少使用 5 个短文中标有下划线的关键词语；3. 续写部分分为两段，每段的开头语已为你写好；4. 续写完成后，请用下划线标出你所使用的关键词语。Paragraph 1:Carol then found herself in the city with her friends.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Paragraph 2:Carol’s brother Rob was calling her for lunch and Carol woke up.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________