题目

如图所示，足够长的水平传送带以速度v沿顺时针方向运动，传送带的右端与光滑曲面的底部平滑连接，曲面上的A点距离底部的高度h＝0．45 m．一小物块从A点静止滑下，再滑上传送带，经过一段时间又返回曲面．g取10 m/s2，则下列说法正确的是A．若v＝1 m/s，则小物块能回到A点B．若v＝2 m/s，则小物块能回到A点C．若v＝5 m/s，则小物块能回到A点D．无论v等于多少，小物块都不能回到A点 I am Sara. I'm at a supermarket (超市) with my sister Claire. Claire and I like buying things at the supermarket, but my parents don't. They like buying things at small stores.Let me see ... First, we need to buy some fruits. We don't have apples or bananas at home. I like apples and Claire likes bananas. Then we need to buy some milk. For breakfast I like having bread, milk and some fruits. Milk is very good for us. Claire doesn't like milk at breakfast, but she likes yogurt (酸奶). We won't buy yogurt today, because we have a lot at home. We need to buy some carrots and tomatoes, too. Carrots are Mom's and my favorite food, but Claire and Dad don't like them. They like tomatoes. Chicken is on our shopping list (购物清单), too. Dad likes chicken at dinner. That's his favorite food.根据材料内容选择最佳答案。【1】Where is Sara?A. At home.B. At school.C. At a small store.D. At a supermarket.【2】What fruits does Sara need to buy?A. Apples and pears.B. Bananas and apples.C. Pears and strawberries.D. Strawberries and bananas.【3】Who likes yogurt at breakfast?A. Sara.B. Sara's sister.C. Sara's dad.D. Sara's mom.【4】Sara's dad doesn't like ______.A. carrotsB. chickenC. tomatoesD. milk【5】下列哪项陈述是正确的？A. Sara's parents like going to the supermarket.B. Yogurt is on Sara's shopping list.C. Chicken is Sara's favorite food.D. Sara's mother likes carrots.