68．A 　细节理解题。根据第二段“They then evaluated the participants' multitasking ability with a tricky mental task…”可知评估的是参与者的同时处理多重任务的能力。

　　69．C 　细节理解题。根据第四段“…but because they're distractible…”可知，人们同时处理多重任务是因为他们容易分心，而不是高效。distractible“容易分心的，不专心的”，C项是对它的同义转换。

　　70．C 　细节理解题。从最后一段“…are generally less sensitive to risky situations”可知，同时处理多重任务者对于潜在危险不能及时做出反应。

　　【阅读理解】

　　Skeptics are a strange lot.Some of them refuse to admit the serious threat of human activities to the enviroment, and they are tired of people who disagree with them.Those people，say skeptics，spread nothing but bad news about the environment.The “eco­guilt”brought on by the discouraging news about our planet gives rise to the popularity of skeptics as people search for more comforting worldviews.

　　Perhaps that explains why a new book by Bjorn Lomborg received so much publicity.That book ，The Skeptical Environmentalist, declares that it

　　measures the “real state of the world”as fine. Of course ，another explanation is the deep

　　pockets of some big businesses with special interests. Indeed, Mr. Lomborg's views are similar to those of some industry­funded organizations, which start huge activities through the media to confuse the public about issues

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