III. 部分练习讲解

　　P305 Bridging the Gap

　　Directions: Fill in the blanks with a word or a phrase that best completes the passage. You may choose a suitable one from the list given.

　　解题方法：把词分类

　　动词　　　　　　形容词 　　　代词/限定词

　　compared to　 　　low 　　　　　another

　　require 　　　　　personal

　　running out of 　 economic

　　refers to　　　　　positive

　　limited

　　Often referred to as green transport, sustainable transportation is the way of the future. Transport powered by gas and petrol is running on a 1 limitedtime frame(时间范围，期限), as both these sources are unsustainable in the long run. In contrast, sustainable transportation offers an option to a world rapidly 2 running out ofrenewable(可再生的) fuel sources. It 3 refers toany kind of transport that has a low impact on the environment, such as walking, cycling, mass transit, green vehicles, and car pooling(集体用车，拼车), amongst others.

　　Any mode of transport is deemed sustainable if it has a 4 lowenvironmental impact and uses little or no fuel. Walking is the best example of sustainable transportation, as it does not 5 requireany gas. However, walking can be impractical if you are travelling longer distances. Cycling is 6 another green transport option and is a far more practical option for longer commutes.

　　Using public transportation, such as buses or trains, is also more sustainable 7 compared toprivate vehicles. The amount of fuel used to transport a bus full of people is more effective compared to a single person driving a 8 personal car. A sustainable transport system has a 9 positiveimpact on the environment, and helps to promote social and 10 economicsustainability(可持续性) in the communities it serves. Increased mobility usually results in better socio-economic conditions:

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