按国际卜的规定，国际单位制的基本单位、辅助单位、具有专门名称的导出单位以及直接由以上

B The Ancient Olympic Games古代奥林匹克运动会
According to historical records，the first (1) Olympic Games can be traced back to 776 BC.They (2) dedicated to the Olympian gods and were staged on the (3) plains of Olympia.They continued for nearly 12 centuries， (4) Emperor Theodosius decreed in 393 A.D.that aU such"pagan cults" (5) banned.
The oldest myth which concerns the beginning of the (6) Games is that of Idaios Daktylos Herakles.According to other (7) ，Zeus，the father of humanity，fought and defeated Cronus in a (8) for the throne of the gods.Finally，the well-known (9) Herakles is mentioned who staged games in Olympia in honour (10) Zeus,because the latter had helped him conquer Elis when (11) went to war against Augeas.
Through the 12 centuries of (12) Olympic Games，many wonderful athletes competed in the stadium and (13) hippodrome of ancient Olympia’s sacred area，moving the crowds with (14) great achievements.Although mortal，their Olympic victories immortalised them.Of (15) best athletes who left their mark on the sacred vallev (16) Olympia，some surpassed all limits and became legends by winning (17) successive Olympic Games and remaining at the forefront of their (18) for more than a decade.
The ancient Olympic Games were (19) a one.day event until 684 BC.when they were extended (20) three days.In the 5th century B.C.，the Games were extended again to cover five days.

《观察植物细胞》和《观察人的口腔上皮细胞》的实验你掌握了吗？测一测吧！   

（1）用洋葱鳞片叶表皮细胞和口腔上皮细胞制作的玻片标本叫_____。  

（2）在制作洋葱鳞片叶表皮细胞和口腔上皮细胞玻片标本的实验中，开始在载玻片上分别用滴管滴一滴_____和_____。   

（3）在上述两个实验中用______进行染色。   

（4）洋葱鳞片叶表皮细胞与人口腔上皮细胞相比，相同的结构是_____、_____ 和_____，不同的结构是洋葱鳞片叶表皮细胞有_______和______。

下面有关操作的特点正确的是( )。

A．物质性、外显性、展开性
B．观念性、内潜性、简缩性
C．观念性、内潜性、展开性
D．物质性、外显性、简缩性

吸烟防火“八不要”是什么？

目前，我国不能使用流量计的计量方式作石油及其产品计量。