D．Today the elephant population is estimated at 5,150．54．The passage is most probably from ________．

　　A．a travel guide

　　B．a history book

　　C．a popular science magazine

　　D．an official announcement50. B

　　从第一段第二行Unlike its African cousin, the Asian elephant is easily domesticated可知

　　51. A

　　从第一段第三行The rare so-called white elephants have actually lent the power of royalty to its rulers，and until the 1920s the national flag was a white elephant on a red background可知。

　　52.

　　D

　　从第二段第二句Out of work and out of land, the Thai elephant struggles for survival in a nation that no longer needs it可知。

　　53.

　　D

　　从最后一段最二句However, today there are probably no more than 3,800, with another l,350 wandering free in the national parks可知。

　　54.

　　C

　　通读全文可知。

　　阅读理解。

　　The baby is just one day old and has not yet left hospital. She is quiet but alert(警觉). Twenty

　　centimeters from her face researchers have placed a white card with two black spots on it.She stares at it carefully. A researcher removes the card and replaces it by another, this time with the spots differently spaced. As the cards change from one to the other，her gaze(凝视) starts to lose its focus—until a third, with three black spots, is presented. Her gaze returns：she looks at it for twice as long as she did at the previous card. Can she tell that the number two is different from three, just 24 hours after coming into the world?

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