小华在“探究小灯泡的亮度与哪些因素有关”的实验中，所用电源电压恒为3V，小灯泡上标有“2.5V”字样

阅读下列短文，从每题所给的四个选项 （A 、B 、C  和 D ）中，选出最佳选项。

    George Bernard Shaw，the greatest and funniest British dramatist(剧作家)of the first half of the 20th century，was born in Dublin，Ireland，on July 26,1856.His early life was not happy. His father was a selfish man who drank too much and could not support his family properly. His mother was a disappointed，unhappy woman who found more pleasure in studying music than in her children. Bernard and his two sisters received little love and attention from their mother while they were young. At the age of ten Shaw entered school. At first he was the best student，but soon he was at or near the bottom of his class.

    Although he did not like school，Bernard was a good，bright，curious student. His lifelong interest in everything from music and art to machines and medicine began from school life. The interests of this tireless schoolboy were literature and music. He often entertained(使快乐)his classmates with stories he read.

    Early at the age of fifteen，he went to work in an office. He did well as an office clerk，but after five years he decided that he wanted to be a writer. He left Ireland and went to London，where he began to write seriously. Seventy-four years later the great dramatist died.

判断对错．

最简分数都能化成有限小数．

选词填空。

发明    发现    实现

①恐龙在进化中飞向蓝天，是科学家在古生物研究方面的一大____。

②考古工作者最近又____了一个古墓群。

③用太空葫芦提取的苦瓜素来治疗糖尿病是医学上的一重大____。

④“神舟五号”的发射，____了中华民族的飞天梦。

培育    培养

⑤经过多年努力，专家们已经____出太空水稻。

⑥他埋头苦干了几年，为祖国____了一支能征善战的新球队。