B．He used fire to keep warm.

　　C．He wore form­fitting clothes made from fur with simple tools.

　　D．He might have been shorter and wider than previously thought.

　　答案：D　推理判断题。由倒数第二段“People in general who live in colder climates tend to be shorter and wider”可推知，北京人可能比我们原先预计的要矮胖，这样才能与当时的气候相适应。

　　4．The passage can probably be found in________.

　　A．a history textbook

　　B．a scientific magazine

　　C．a research report

　　D．an entertainment newspaper

　　答案：B　推理判断题。由全文文章大意可推知。

　　B

　　(2012·泸州一诊)

　　Gary Kidd had a pretty good idea that what his 3­year­old grandson had found was no rock, but the tooth of a woolly mammoth (猛犸)．That's because he had found one himself nine years ago.Kaleb Kidd was catching some squirrels last Monday near La Crosse when he spotted what looked like an unusual rock.

　　“Grandpa, what's that？” Kaleb asked.He told his grandson it looked like the tooth of the extinct (灭绝) woolly mammoth.Next stop was the Mississippi Valley Archaeology Center at the University of Wisconsin, which proved that it was, indeed, the tooth of a mammoth.

　　Connie Arzigian, the center's lab director, said it could be 10,000 to 30,000 years old.It weighs 2 pounds and measures 15 centimeters long and 7.6 centimeters wide.

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