下列实例中，通过热传递的方式改变物体内能的是（　　）

回眸千百年来人类文明发展的历程，从不同民族、不同地域与不同历史时期，我们都能看到这样一种现象：人类社会物质文明的发展相对发达之时，社会的政治文明和精神文明也呈现出蓬勃之势，反之亦然。这说明人类社会的发展 （   ） 

我国科学家培育出了“青虫不吃的青菜”，培育这种青菜用到的生物技术是(    )

    Xian Xinghai was a very famous musician in China. He wrote one of the greatest pieces of music of the 20^th century. In his short life he wrote 1 300 songs and an opera.

    Xian was born in Panyu, Guangdong, China in 1905. Because his father died before he was born, Xian moved from place to place with 2 mother. He began learning to play 3 violin when he was 20 years old. In the beginning, his violin was 4 cheap and badly made that he5not play it well. His friends laughed at him. Xian did not stop 6 and soon showed his talent. In 1934, he was one of the first Chinese students7studied in a special music school in Paris. Before he 8, Xian became the school's best student 9 won several prizes for his talents.

    In 1935, he returned to China and helped fight against the Japanese army. Later, he came to Yan'an 10 music at a college. 11 there were no pianos in Yan'an at that time Xian still wrote 12 of his most important music there, including The Yellow River, his most famous work.

    In May 1940, Xian 13 to the Soviet Union by the Chinese Communist Party to write music for movies. In the Soviet Union, life was very 14. Xian got sick and later died of a lung illness 15 October 30, 1945, aged only 40. Xian's music, however, lives on in the people's hearts.

主要运输方式的运量和速度关系图。