Question

Each time a city building goes up, the grass in that spot and trees that once reached up to the sky are replaced by a swath of asphalt (瀝青) roof.

Add to that the building of roads, parking lots, and yet more buildings, and the total lost green space can have a very real effect on a city's air temperature, air quality, and energy costs. On a summer day in most American cities, an asphalt roof can feel like the inside of an oven. But what if we could replace the hot roof of each skyscraper or building in a city with grass or a garden? 

Whether it holds vegetable gardens, wildflowers, or meadow grasses, a green roof can lower the temperature above a building by 60 degrees, which can reduce the building's energy costs and, if used more widely, could decrease a city's total energy costs, reduce power-plant emissions (散發(fā)), and improve air quality and public health. 

But that's not all -- green roofs are a great way to deal with water management in urban areas with mixed sewerage(排污) systems because they soak up extra precipitation(沉淀物). They are also a good way to provide shelters for urban wildlife, and actually extend the life span of the roof itself. And green roofs do something else: They can beautify the city -- whether you're on the 3rd floor or the 30th. So that will be a great achievement.

The environmental nonprofit group Earth Pledge is starting a Green Roofs Initiative. To learn more about how to create a green roof -- and the benefits(好處) it will provide -- visit its website at EarthPledge.com.

72. Which of the following statements best summarizes the main idea of the passage?

A. The benefits of growing a garden in the sky

B. The steps of creating green roofs in the city

C. A Green Roofs Initiative started by EarthPledge.com

D. The ways of preventing pollution and beautifying the city

73. The benefits green roofs bring to the city don’t include_______ according to the passage.

    A. reducing the building's energy costs

    B. replacing air conditioners to control temperature

    C. providing sanctuaries for urban wildlife

    D. improving air quality and public health

74. To grow a garden roof in the sky is largely because _________

    A. the global temperature is becoming hotter than before

    B. more buildings take up too much land green space，

    C. more green vegetables are planted to improve people’s life .

    D. tar roofs can cost us more money and pollute the air.

75. It can be inferred from the passage that________.

    A. garden roofs has completely replaced tar roofs in the city

    B. building green roofs needs much efforts and money

    C. the idea of growing garden roofs hasn’t been fully carried out

    D. green roofs have good points and bad points

Answer 1

72.A 主旨大意題。全文主要講述了建立空中綠色花園的好處，第一段提出問題，引入主題，下文具體介紹了空中綠色花園在保護環(huán)境、節(jié)能等方面的好處。

73.B細節(jié)理解題。由第三、四段可知， B項沒有在文章中涉及到。文章中只提到了 “…a green roof can lower the temperature above a building by 60 degrees..”, 但不能推出綠色房頂可以取代空調(diào)調(diào)節(jié)溫度。

74.B 細節(jié)理解題。由第一段和第二段的第一句可知，由于地面建筑的日益增加，地面綠色空間正逐漸減少，這會影響城市的大氣溫度和質量，消耗更多的能源。故答案為B項。

75.C 推理判斷題。由第二段最后一句 “But what if we could replace the hot roof of each skyscraper or building in a city with grass or a garden?” 和第四段的最后一句 “So that will be a great achievement.”可以推出建立花園房頂?shù)南敕ìF(xiàn)在還沒有實施, 這只是未來的設想。故C

項為正確答案。其他選項從文中均不能推出。