文物是历史研究的重要对象。结合如图分析，对该文物理解正确的是（    ）

材料：英国近代生物化学家、科学技术史专家和汉学家李约瑟，在1943年所著的《中国的科学与文明》一书中，完整地提出了中国古代的四大发明。四大发明是中国古代劳动人民勤劳智慧的结晶，是我们继往开来创新发展的基石。

请答出我国古代的四大发明及每项发明的意义。

   “Which meal do we all need most, breakfast, lunch or dinner?” Miss Baker asks. Boys and girls wave their hands in the air. They know the answer.“What do you think, Jim?” Miss Baker asks.“Dinner,” Jim answers.“Dinner is the big meal of the day,” says Miss Baker. “But I don’t think we need it most.”Tom puts up his hands. “ Do we need lunch most?”“No,” says Miss Baker. “We need breakfast most.”“Why is this so?”“From night to morning is a long time to go without food,” says Ann.“That’s right,” says Miss Baker. “We need food every morning. What may happen to us if we have no breakfast?”The students have many answers to give.“We may feel hungry.”“We may not feel like working.”“We may feel sick.”“Yes, you are right,” says Miss Baker. “Now let’s talk about what makes a good breakfast. Give me your answers. I will write them on the blackboard.”

-- Can a camel swim?

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