根据材料，回答问题。

材料：近代以来，伴随着经济崛起，美国城市化发展迅速。纽约中央公园创建于1851年，是美国第一个真正意义上的大型城市公园。19世纪中叶，纽约成为美国名副其实的“经济首部”，人口超过了英国的工业中心利物浦、曼彻斯特、伯明翰的总和。同时“城市中，复杂、依赖、贫穷和痛苦，再加上有如古罗马那样的肆无忌惮的奢侈，已取代了朴素、工此自由和财富均等，恶行、犯罪和疾病已进入了城市。”

一些学者提出一个可以为社会各阶展提供观光、休闲和娱乐服务的大型城市公园，将会促进社会各阶层间的交流与融合，从而在一定程度上来化解社会阶层之间的尖锐矛盾。建设城市公园也是纽约商人为了促进地产升值、保持经济持续增长的需要.。

——摘录自兰科维奇《纽约简史》

依据材料和所学，分析纽约创建中央公园的背景和意阁。

关于飞机升力的解释，以下说法正确的是（　　）

Memories about Teachers

    Recently we made a survey (调查)and asked a large number of people to tell us about their teachers. Here is what they remembered about their teachers:

    "What teachers do I remember? Well, I remember my first teacher. She was so kind and pretty, and she told us many interesting stories."

    "I remember an English teacher . he always had colored socks: red, green, even orange,"

    "I remember a math teacher. She was always dressed very well. I couldn't stop looking at her. I wanted to be like her."

    "Our chemistry teacher. He was so strict. We were afraid of him. I don't think he liked us."

    "The physics teacher was so boring. He could make us fall asleep very quickly."

    "One year we had a really good Chinese language teacher. He was very patient and told very funny stories. He was popular with all the class. We always worked hard for him. We are his friends,"

    "The P.E. teacher always said I was stupid. I thought teachers should give us encouragement. I am not interested in sports because of him."

    "I had one history teacher who always wore clothes of the same color. In three years I never saw him change."

    "I remember two teachers well. One was my music teacher who was very active, and usually had a loud voice. The other was my computer teacher, who was very serious, but here ally helped me when I had problems at any time."

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