按国家税法规定不应计入建筑安装工程费用的税收是( )。
A.营业税
B.城乡维护建设税
C.教育费附加
D.消费税
参考答案:D
在探究“鱼鳍在游泳中的作用”时,某小组同学正在讨论探究计划,他们按甲、乙、丙、丁的顺序依次发言.你看,一个人一个主意.请你来分析其中蕴含的科学方法.
(1)丙提出的方法在科学研究中叫做______,本实验采用这种方法最主要的优点是______.
(2)丙与丁提出的实验方案,可使实验结果更为可靠的是______的.因此,生物科学研究中,在同时有活体和模型可供选用的情况下,应首选______作为实验材料.
(3)丁提出的实验方案中的A、B分别探究______、______在游泳中的作用,它们是实验组还是对照组?______.
(4)乙认为,几个鳍同时摆动,不易观察单个鳍的作用,应对某个鳍的作用单独进行研究.乙的观点反映了科学实验要遵循______的原则.甲提出的直接观察的方法不能得出准确的结论,但可以为探究过程中______提供依据.
短文改错(共10小题,每小题1分,满分10分)
Not all people like to work and everyone likes to play. All over the world men and woman, boys and girls enjoy sports. Since long ago, many adults and children called their friends together to spend hours, even days play games. One of the reasons people like to play is that sports help them to live happy. In other words, they help to keep people strong and feel well. When people are playing games, they move a lot .That is how sports are good activities for their health. Having fun with their friends make them happy .Many people enjoy sports by watching others play. In American big cities, thousands sell tickets to watch football or basketball games.