作为蛋白质合成的模板 A．tRNA B．mRNA C．hnRNA D．snRNA E

Ronaldo was born on September 22, 1976. He loved football at a very young age. When he was four, his father gave him a football as a Christmas present. From then on, he _小题1:_(play) with it every day.

At the age of 14, he gave up school _小题2:__(be) a real football player. Ronaldo began playing for Cruzeiro, a football club on May 25, 1993. Ronaldo _小题3:_(name)World Soccer Magazine’s Player of the year after his_小题4:(succeed) for Brazil in the 2002 World Cup. He scored eight _小题5:(goal) in the World Cup. It is the most since West Germany’s Gerd Mueller scored ten in 1970. 小题6:_(Unluck), one of his knees _小题7:_(hurt) badly during a football match. Then he had to stop _小题8:_(have) a good rest for about a year. What a pity! But when he restarted his career, he did as 小题9:_(wonderful) as before. He loves football and regards it as his life. Never he _小题10:_(give) up until he can’t play anymore.

Ronaldo _小题11:_(support) by more than 26 percent of all football fans. He _小题12:_(win) the FIFA(国际足联) prize three times. He is now a real star for the young football fans.

一条老年金鱼患上了浮鳔病，这种疾病使它沉到水箱底部浮不起来，它的主人给它穿上用软管制作而成的“救生衣”后，它重获新生，再次正常游泳。如果水箱内水深0． 8 m，金鱼和“救生衣”总质量0．2 kg, 金鱼悬浮在水中，如图所示。请计算:

（1）金鱼和“救生衣”受到的浮力是多少?

（2）水对水箱底部的压强是多少？

目前，关于人类胚胎干细胞研究和应用中道德争议的焦点问题是（）。

A.人类胚胎干细胞的功能到底如何

B.人类胚胎是否是生命、是否应该得到尊重

C.人类胚胎发育阶段如何划分

D.人类胚胎干细胞是否可以商品化

E.人类胚胎是否可以克隆

( )指为了查明或确定与案件有关的某一事实或情节在某种条件下能否发生或如何发生，而在同等条件下将该事实或情节人为地加以重演的一种侦查方法。

A．现场勘查
B．物证检验
C．人身检查
D．侦查实验

变速给水泵是通过调整（）来保证锅炉正常供水。