24．According to the passage, what will scientists most probably do in the future?

　　A．They will work hard to reduce ocean noise pollution.

　　B．They will protect animals from harmful noises.

　　C．They will try to set a limit of 120 decibels.

　　D．They will study the effect of ocean noise pollution.

　　答案：B　推理判断题。由文章的最后一句话They want to prevent noises from harming creatures in the ocean. 可知科学家将来要采取措施阻止噪音对海洋生物的伤害，故选B。

　　B

　　The USA is a land of immigrants. Between 1815 and 1914, the world witnessed the greatest peaceful migration in its history:

　　35 million people, mostly Europeans, left their homelands to start new lives in America. Why did these people risk everything by leaving their homes and families?

　　First, what forced emigrants to make the decision to leave? One major cause for European farmers to leave was the rise in population which in turn led to land hunger. Another was politics. There was an increased taxation(税收) and the growth of armies, and many young men fled eastern Europe to avoid being forced to join the army.

　　Physical hunger provided another pressing reason. Following the collapse (衰退)of the economy of southern Italy in the 1860s, hundreds of thousands decided to start a new life in America. Religion also encouraged millions to leave the Old World.

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