7．What is the passage mainly about?

　　A．The custom of sharing food.

　　B．The specific meaning of food.

　　C．The role of food in ceremonies.

　　D．The importance of food in culture.

　　答案：D　主旨大意题。文章按照总—分—总的结构展开，首段开篇明义——请客吃饭是一种交际形式，有两种基本的表现方式。中间部分分别阐述两种不同的作用，最后一段总结全文，再次阐释食物在不同文化中的重要性。故选D项。

　　(三)挖隐含信息，概括主旨

　　(2015·四川·E)

　　No one is sure how the ancient Egyptians built the pyramids near Cairo.But a new study suggests they used a little rock‘n’roll.Long­ago builders could have attached wooden poles to the stones and rolled them across the sand, the scientists say.

　　“Technically, I think what they're proposing is possible，” physicist Daniel Bonn said.

　　People have long puzzled over how the Egyptians moved such huge rocks.And there's no obvious answer.On average, each of the two million big stones weighed about as much as a large pickup truck.The Egyptians somehow moved the stone blocks to the pyramid site from about one kilometer away.

　　The most popular view is that Egyptian workers slid the blocks along smooth paths.Many scientists suspect workers first would have put the blocks on sleds(滑板)．Then they would have dragged them along paths.To make the work easier, workers may have lubricated_the_paths either with wet clay or with the fat from cattle.Bonn has now tested this idea by building small sleds and dragging heavy objects over sand.

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