67What is the passage mainly about?

　　A．How Rossby waves are found．

　　B．Where El Nino is formed．

　　C．What the models predict．

　　D．How the models work．

　　68．Where does El Nino often appear?

　　A．Along the western coast of the US.

　　B．In the Pacific in the south, of the equator．

　　C．In the Pacific in the north of the equator．

　　D．Along the southern coast of South America．69．What is right according to the passage?

　　A．Rossby waves and Kelvin waves move in opposite directions along the equator．

　　B．People could explain El Nino before the creation of the mathematical models．

　　C．Adequate sea-level waves can produce westward positive cold cycle．

　　D．The speed of Rossby waves is faster than that of Kelvin waves．

　　70．What does the underlined word "waves" in Paragraph 3 refer to?

　　A．Kelvin waves．B．Sea-level signals．C．Coastal waves．D．Rossby waves．

　　Linguistic（语言学的） Puzzles

　　How did language begin? What was the world's first language? Do all languages come from one, original language?

　　71

　　.

　　In the 4th century BC, the Greek historian Herodotus wrote this account: Psamtik I an Egyptian King, wanted to find out what the oldest language in the world was．

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