48. What’s David Lanfear’s attitude towards the straw houses at last?

　　A. Doubtful

　　B. Approving

　　C. Defensive

　　D. Negative

　　【答案】B

　　【解析】推理判断题。根据He has now helped to build more than ten straw bale houses and says the building material is becoming more widely accepted. 最后David Lanfear是同意接受了用草做成的房子的。故选B。

　　49. Which of the following is NOT the advantage of the house built with straw bales?

　　A. It is environmentally friendly.

　　B. The supply of its building materials is easily guaranteed.

　　C. It is comparatively economical.

　　D. It is free from fires.

　　【答案】D

　　【解析】细节理解题。根据So it can be seen as having no harmful effects on the environment.这种房子是环保的，选项A符合原文；that’s readily available.这些草是可以再生的，更新快，所以房子的原料是可以保证的，选项B符合原文；it’s a relatively inexpensively renewable material that’s readily available. 这种房子是经济适用，花费不多，选项C符合原文；以上都是草屋的优点，只有选项D没有提到，故选D。

　　50. Which of the following is NOT true according to the passage?

　　A. Professor Walker is still not very sure about whether the straw bales and hemp material are as useful as they expect.

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