When we think of trees at Christmas, there is one that immediately springs (跃入) to mind—the evergreen tree that people decorate with ornaments and place their presents under. The custom dates back almost a thousand years to Germany. Nowadays 33 to 36 million Christmas trees are produced in America and 50 to 60 million in Europe each year. Some trees are sold live with roots and soil so people can plant them later and reuse them next year.

　　Some people prefer artificial trees as they are reusable and much cheaper than their natural alternative. However, environmentalists point out that they are made from petroleum (石油) products and so have many contamination (污染) issues.

　　文章大意：最近几年，圣诞节送圣诞贺卡和圣诞树这两项传统受到了环保主义者的批评。

　　67．What is the main idea of the article?

　　A.To introduce the history of two typical Christmas traditions.

　　B.To point out the problems in some traditional ways of celebrating Christmas.

　　C.To analyze how two Christmas traditions grew in popularity.

　　D.To explain the debate between environmentalists and traditionalists regarding some Christmas traditions.

　　答案：D　主旨大意题。由文章大意可知，本文讲述了环保主义者攻击圣诞节的一些习俗不环保以及人们对此的争论。

　　68．Some people suggest getting rid of paper cards because________.

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