北京市崇文区高三2010届一模英语(8)

北京市崇文区高三一模英语

atmosphere is correct, is to be found in the ocean．

It has long been known that during an El Nino, two conditions exist: unusually warm water extends along the eastern Pacific and winds blow from the west into the warmer air rising over the warm water in the east．The contribution of the model is to show that the winds of an El Nino, which raise sea level in the east, send a signal to the west lowering sea level at the same time．According to the model, that signal is created as a negative （负的） Rossby wave, a wave of lower sea level, that moves westward parallel to the equator at 25 to 85 kilometers per day．Taking months to move across the Pacific, Rossby waves march to the western boundary of the Pacific basin, which is modeled as a smootli wall but in reality consists of quite irregular island chains．

Rossby waves will be broken into many coastal Kelvin waves carrying the same negative sea-level signal．These eventually shoot toward the equator, and then head eastward along the equator drove by the earth at a．speed of about．250 kilometers per day．When enough Kelvin waves of adequate amplitude （振幅） arrive from the western Pacific, their negative sea-level signal overcomes the feedback mechanism, raising the sea level, and they begin to drive the system into the opposite cold mode．This produces a gradual change in winds, one that will eventually send positive sea-level Rossby waves westward, waves that will eventually return as cold cycle—ending positive Kelvin waves beginning another warming cycle．

67．What 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 USA.[来源:学.科.网]

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．

第二节：（共5小题；每小题2分，共10分）

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Linguistic（语言学的） Puzzles

How did language begin? What was the world's first language? Do all languages come from In the 4th century BC, the Greek historian Herodotus wrote this account: Psamtik I an