3．We can learn that the Gregorian calendar

　　.

　　A．is a perfect calendar

　　B．was created 500 years ago

　　C．is based on Julius Caesar’s idea

　　D．was once questioned by mathematicians

　　解析：选C。细节理解题。由第五段首句可知，现今普遍使用的Gregorian calendar是在Caesar的历法的基础上做了改进。

　　4．According to the text，which of the following is a leap year?

　　高中学习网 www.gkxx.comA．1900. B．2000.

　　C．2002. D．2017.

　　解析：选B。推理判断题。由第五段可知，能被4整除的年份才是闰年，但世纪之交年能被400整除才叫闰年。故B项正确。

　　B

　　初中学习网(2016·河南高考前全真模拟)Chinese railway experts have begun talks on building a record­breaking high­speed rail that will connect Inner Mongolia in the north to Hainan in the south.

　　According to the Shaanxi Development and Reform Commission，the proposed line will operate at a speed of 350 kilometers per hour.

　　Beginning in Inner Mongolia’s Baotou and running through southern Shaanxi，Hubei，Hunan，Guangxi and Guangdong，its final stop would be in Haikou on Hainan Island，China’s southernmost province.

　　Though the exact length of the proposed route has not been released，it will likely become the world’s longest high­speed rail line as the journey by road between Baotou and Haikou is about 3,000 kilometers long.Currently，the world’s longest high­speed rail line is almost 2,300 kilometers long，running from Beijing to Guangzhou.

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