题目

细胞是生命系统最基本的结构层次，“每一个生物科学问题的答案都必须在细胞中寻找”。下列有关说法正确的是( ) A . 神经细胞中的水和蛋白质分子属于生命系统的结构层次 B . 池塘中的水、阳光等环境因素属于生命系统 C . 细胞学说使人们对生命的认识由细胞水平进入到分子水平 D . 细胞学说的创立过程完全由施莱登和施旺两人完成阅读下面短文，根据短文大意及图示，在每个空格上填上一个意义相符、形式正确的单词。 Can you imagine trying to write music if you were deaf? Most of us couldn't dream of it. But for the great composer(作曲家) Ludwig Van Beethoven, this was no problem at .Beethoven was not deaf at fist. He was on Dec. 16, 1770 in Bonn, Germany. He lived a (an) life, and faced much sadness. One of his piano pieces, Fur Elise 《致爱丽丝》,was for a sad love story.At the age of 26, Beethoven began to lose his hearing. Yet he was able to go on writing music hearing vibration (振动). There is a story that after a good performance, people cheered and clapped(鼓掌). Beethoven could not them clapping, and when he turned around and realized what happened, he was excited and to cry.Before Beethoven, most music was very controlled (克制的). He changed all this created a powerful, violent sound. At , many people hated his music, saying it was too emotional(情绪化). now many people fall in love with his music.