单选题下列有关哺乳动物个体发育的叙述，错误的是______。 A.胚胎发育过程中也会出现细胞衰老 B.幼鹿经过变态发育过程长出发达的鹿角 C.胚后发育过程中伴有细胞分化 D.来自原肠胚同一胚层的细胞经分化发育成不同的组织

单选题人们经常在草坪上行走，会造成土壤板结，从而影响草的生长，土壤板结影响植物生长的主要原因是______。

单选题教师自觉利用环境和自身教育因素对学生进行熏陶和感染的德育方法是______。 A.自我教育法 B.榜样示范法 C.实际锻炼法 D.陶冶教育法

单选题(一) In October 1961 at Crowley Field in Cincinnati Ohio, an old deaf gentleman named William E. Hoy stood up to throw the first hall of the World Series. Most people at Crowley Field on that day probably did not remember Hoy because he had retired from professional baseball 58 years earlier in 1903. However he had been an outstanding player and the deaf people still talk about him and his years in baseball. William E. Hoy was born in Houckstown Ohio on May 23, 1862. He became deaf when he was two years old. He attended the Columbus Ohio School for the deal After graduation he started playing baseball while working as a shoemaker. Hoy began playing professional baseball in 1886 for Oshkosh (Wisconsin) of the Northwestern League. In 1888 he started as an outfielder with the old Washington Senators. His small figure and speed made him an outstanding base runner. He was very good at stealing bases during his career. In the 1888 major league season he stole 82 bases. He was also the Senators' leading hitter in 1888. Hoy was clever and he threw right-handed and batted left-handed. On June 19, 1889 he threw out three batters at the plate from his outfield position. The arm signals used by judges today to show balls and strikes began because of Hoy. The judge lifted his right arm to show that the pitch was a strike and his left arm to signal that it was a ball. For many years people talked about Hoy's last ball game in 1903. He was playing for Los Angeles of the Pacific Coast Winter League. It was a memorable game because Hoy hit a wonderful ball which won the game. It was a very foggy day and therefore very hard to see the ball. In the ninth inning with two men out, Hoy managed to catch a fly ball to make the third out in spite of the fog. Los Angeles defeated their opposition and won the game. After he retired, Hoy stayed busy. He ran a dairy farm near Cincinnati for 20 years. He also became a public speaker and traveled giving speeches. Until a few years before his death he took 4—10 mile walks several mornings a week. On December 15, 1961 William Hoy died at the age of 99.

单选题某植物群体基因型的种类和E匕例为AA:Aa:aa=1:4:1，比较自交一代与随机交配一代得到的两个子代群体______。 A．基因型频率相同 B．纯合子比例不同 C．基因频率不同 D．杂合子比例相同

单选题“其实胸中之竹，并不是眼中之竹也，因而磨墨展纸，落笔倏作变相，手中之竹又不是胸中之竹也。”郑板桥的这句话蕴含的道理是( )。

单选题My mother ______ the windows already, so the room looks much brighter.A. has cleanedB. had cleanedC. is cleaningD. will clean

单选题学生通过体育活动获得愉快的情绪体验，这说明学校体育具有______。

单选题说课是教师以（ ）为指导，在精心备课的基础上，面对同行、领导或，主要用口头语言和有关的辅助手段阐述某一学科的教学设计，并与听者一起研讨进一步改进和优化教学设计的教学研究过程。

单选题决定成立联合国的国际会议是______ A．巴黎和会 B．华盛顿会议 C．雅尔塔会议 D．联合国大会

单选题中医学是传统文化的一朵奇葩，被誉为“东方医学巨典”的是______。

单选题从整体上看，人类的智力分布基本呈现为______。

单选题教育一直是党和国家最重视的问题，1982年党的（　　）第一次把教育列为经济发展的战略重点之一。

单选题【2014．辽宁大连】直接影响活动效率，使活动顺利完成的个性心理特征是( )。

单选题我国奴隶社会“学在官府”的现象，体现的教育特点是( )。

单选题黄色圆粒和绿色圆粒豌豆杂交，其子代的表现型统计结果如图所示，则杂交后代中新表现型个体占的比例为()。

单选题You must keep your eyes ______.

单选题已知二次函数y=ax 2 +bx+c，其中a＞0，且4a一2b+c＜0，则有( )．

单选题根据法国作家小仲马的同名小说改编的三幕歌剧《茶花女》，是19世纪意大利著名作曲家______的作品。

单选题权力运行需要制约和监督。有人形象地将此绘成漫画(见下图)“把权力关进制度的笼子单”这有利于()。①防止权力被肆意滥用②使权力失去应有作用③使社会达到绝对公平④保障社会的公平公正