如图所示，在圆形区域内有方向垂直向里的匀强磁场．有一束速率各不相同的质子自A点沿半径方向射入磁场，这些质子在磁场中

随着人们健康意识的提高及食品安全问题日益严重，纯天然、绿色、无污染、健康的有机绿色食品越来越受消费者关注，然而在购买时市民充满了矛盾之情，由于其价格较高，不少市民望而却步。以下对材料的分析正确的是（   ）。

①抓住消费者从众心理是有机绿色食品企业的品牌营销策略

②“市民充满矛盾之情”体现了商品两个基本属性之间对立的一面

③“不少市民望而却步”说明收入水平是影响消费的主要因素

④有机绿色食品高价格的根本原因是企业使用了创新的技术

    Last weekend we had a birthday for our classmate Zhang Xiaohui. She is younger than me, but I am shorter than her. And she looks stronger. Of course she is heavier than me. We went to a shop to buy a present for Xiaohui. What did we buy? We bought a doll for her. Because she told me " I haven't got a lovely doll." When she got our present she looked excited. She was very happy. We went to the zoo. We saw elephants. We wanted to row a boat in Jingming park, but it was later, we had to went home. We had a good time on that day.