“19世纪末，许多科学家宣称物理学的大厦己基本建成，留给后人的只是补充和完善。然而，20世纪初，这座经典物理学大厦轰然倒塌。”导致经典物理学大厦倒塌的原因是（    ）

下列事件中属于侵犯公民人身自由权的是（    ）

下列是有关实验试剂在实验操作中的应用：

（1）用海藻酸钠制成人工种皮，可以保护通过____ 技术获得的胚状体；作为包埋剂的海藻酸钠加热溶解后，冷却至室温再和一定浓度的酵母菌溶液混合，用注射器将混合液缓慢而匀速地注射到一定浓度的____ 中，一段时间后得到了固定化的酵母细胞．

（2）用上述过程获得的固定化细胞和一定浓度的葡萄糖溶液混合一段时间后，用　____ 检测其酒精的生成情况．若经过检测发现没有酒精生成，请分析其可能的原因有哪些？____ （写两点）．用上述固定化细胞发酵获得酒精后，再进行工业纯化，形成浓度为____ 的酒精溶液用于根尖的解离，形成浓度为____ 的酒精溶液用于提纯DNA．

（3）在DNA粗提取实验中配制浓度一般为____ 　的NaCl溶液溶解DNA，析出杂质．在豆腐乳的制作过程中加NaCl的注意事项是什么？____ 

有关大洲地形的叙述，正确的是（    ）

    Yuan Longping, born and ____ (bring) up in China, is a leading figure in the rice-growing world. When he was a boy, he ____ (educate) in many schools, and was given the nickname, “the student ____asks questions.”

    He was interested in plants from an early age, and he studied agriculture in college. As a young teacher, he began ____(experiment) in crop breeding. He thought there was only one way ____ (have) more rice quickly. That was to cross different species of rice plant. Then he began his search for a ____ (specially) type of rice plant. It had to be male and sterile. When the naturally sterile male rice plant was discovered in 1970, it was ____ breakthrough. As a result, China's rice production rose____ 47.5% in the 1990's. And 50 thousand square kilometers of rice fields were converted to ____ (grow) vegetables and other cash crops. ____(follow) this, Yuan Longping's rice was exported to some other countries.