单选题如图为某一段多肽链和控制它合成的DNA双链的一段。“—甲硫氨酸—脯氨酸—苏氨酸—甘氨酸—缬氨酸—”密码子表：甲硫氨酸AUG，脯氨酸CCA、CCC、CCU，苏氨酸ACU、ACC、ACA，甘氨酸GGU、GCA、GGG，缬氨酸GUU、GUC、GUA根据上述材料，下列描述错误的是______。
单选题发展速度素质的方法是______。
单选题甜豌豆的紫花对白花是一对相对性状，由非同源染色体上的两对基因共同控制，只有同时存在两个显性基因(A和B)时，花中的紫色素才能合成，下列说法中正确的是______。
A.白花甜豌豆杂交，后代不可能出现紫花甜豌豆
B.AaBb测交结果紫花与白花的比例为1:1
C.AaBh的紫花甜豌豆自交，后代中紫花和白花甜豌豆之比例为9:7
D.若杂交后代性状分离比为3:5，则亲本基因型只能是AaBb和aaBb
单选题完整的灭火机器人主要包括：输入装置、控制器、输出装置，其输入装置使用了信息技术中的______。
单选题小勇私拿水果摊上的一只苹果，经同学揭发，被老师叫到办公室询问，小勇承认是第五次犯同样的错误了。老师问：“你为什么不改呢?”小勇说：“我，我也晓得不对，就是，就是有时忍不住。”针对小勇的问题，教师应从______入手进行教育。
单选题计算机内部进行算术与逻辑功能的部件是______。
A.硬盘驱动器
B.运算器
C.控制器
D.RAM
单选题2011年3月，( )全国人民代表大会第四次会议在北京召开。
单选题在△ABC中，三内角A、B、C所对的边分别为a、b、c，如果sinB是sinA与sinC的等比中项，那么______．
A.a2=bc
B.2a=b+c
C.b2=ac
D.2b=a+c
单选题下列哪一说法是夸美纽斯的观点?______
单选题经国家批准设立或者认可的______按照国家有关规定，颁发学历证书或者其他学业证书。
A.政府机构
B.企事业单位
C.学校及其他教育机构
D.机关单位
单选题Which of the following tribes first came to Britain?
单选题下列关于计算机主要特点的叙述，错误的是______
单选题African elephants have been slaughtered at alarming rate over the past decade, largely because they are the primary source of the world"s ivory. Their population has been dwindled from 1.3 million in 1979 to just 625,000 today, and the rate of killing has been accelerating in recent years because many of the older, bigger tusked animals have already been destroyed. "The poachers now must kill times as many elephants to get the same quantity of ivory," explained Curtis Bohlen, Senior vice president of the World Wildlife Fund.
Though its record on the environment has been spotty so far, the government last week took the lead in a major conservation issue by imposing a ban on ivory imports into the US. The move came just four days after a consortium of conservation groups, including the World Wildlife Fund and Wildlife Conservation International, called for that kind of action, and it made the US the first nation to forbid imports of both raw and finished ivory. The ban, says Bohlen, sends a very clear message to the ivory poachers that the game is over.
In the past African nations have resisted an ivory ban, but increasingly they realized that the decimation of the elephant herds poses a serious threat to their tourist business. Last month Tanzania and several other African countries called for an amendment to the 102 nation Convention on International Trade in Endangered Species that would make the ivory trade illegal worldwide. The amendment is expected to be approved at an October meeting in Geneva and to go into effect next January. But between now and then, conservationists contend, poachers may go on a rampage, killing elephants wholesale, so nations should unilaterally forbid imports right away. The US government brought that argument, and by week"s end the twelve nation European Community had followed with its own ban.
单选题在Word中，打开文档的过程是______。
单选题马克思主义哲学认为世界在本质上是______。
单选题1922年，甘地认为自己犯了“一个喜马拉雅山般的错误”，宣布停止“非暴力不合作”运动。他所说的“错误”是指他( )。
单选题教师在教育工作中要做到循序渐进，这是因为______。 A．学生只有机械记忆的能力 B．教师的知识、能力是不一样的 C．教育活动要遵循人的身心发展的一般规律 D．教育活动完全受到人的遗传素质的影响
单选题在Internet中，网络层的服务访问点是______。
A.IP地址
B.MAC地址
C.LLC地址
D.端口号
单选题400米跨栏跑中，起跑到第一个栏的距离是______。
单选题圆号属于西洋管弦乐器组中的______