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    We humans live in different parts of the world, but we have the same “mother”. She gives us everything we need in our daily life. She is our Mother Earth.
    April 22 is Earth Day. The theme of this year is “Green Cities”.
    A green city is a healthy and pleasant place for people to live, according to the United Nations.
    A green city can get its energy from renewable (可再生的) sources like solar (太阳能的) and wind power. Also, it is connected by clean public transportation. Moreover, a green city is made up of facilities (设施) that can save energy and reduce waste.
    Around the world, many cities and countries have done well to build themselves in a green way.
    Chicago is well known for its green roof (屋顶) program. These roofs are covered with plants. The plants get a great amount of rainwater. Later, the water evaporates (蒸发) to help make the air cool and clean. So far, there are about 360 green roofs in Chicago, according to the US Environmental Protection Agency.
    Curitiba, Brazil, has great transportation. It opened the world’s first bus rapid transit (BRT) system in 1974. BRT runs on special lanes. This makes sure that buses are on time even in traffic jams. With the help of BRT, the city has the lowest level of air pollution in Brazil. Today, many other countries have copied BRT, including China and Mexico.
    Singapore is home to the first zero-energy building in Southeast Asia. Zero energy means a building is able to create more energy than it uses. Zero-energy buildings work with solar panels (板) mainly on roofs. These panels can make electricity which powers the buildings. By 2030, Singapore plans to build 80 percent of its buildings like this.
    小题1:The theme of Earth Day this year is “_______”.
    A．Green Roofs B．Green Cities
    C．Reducing and Recycling D．Environmental Protection
    小题2:The article mentions that there is BRT in the following countries EXCEPT _______.
    A．Brazil B．Singapore C．China D．Mexico
    小题3:From the passage, we learn that in the three cities _______.
    A．people are encouraged to grow plants on their roofs
    B．special lanes are designed to solve traffic jams
    C．people make good use of solar and wind energy
    D．people are provided with a pleasant place to live
    小题4:The passage is mainly developed by _______.
    A．giving examples B．explaining reasons
    C．listing suggestions D．showing different opinions

    小题1:B
    小题2:B
    小题3:D
    小题4:A

    试题分析：这篇文章讲述的是4月22日是地球日，其主题是“绿色城市”，文中解释了什么是绿色城市以及许多城市建成为绿色城市已经做得很好。
    小题1:细节理解题。根据文中原句The theme of this year is “Green Cities”.（今年的主题是绿色城市），故选B。
    小题2:细节理解题。根据文中原句Curitiba, Brazil, has great transportation. It opened the world’s first bus rapid transit (BRT) system in 1974.及Today, many other countries have copied BRT, including China and Mexico.可知所给答案中除了新加坡没有BRT,其他都有，故选B。
    小题3:细节理解题。根据文中原句A green city is a healthy and pleasant place for people to live ，（绿色城市是人们居住的健康有令人愉快的地方），文中提到的三个城市都是绿色城市，故选D 。
    小题4:结构分析题。根据全文结构，文中列举了三个绿色城市，所以本文的展开主要是用举例子的方法，故选A
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