将等物质的量的F2和ClF混合，在密闭容器中发生反应：F2(g)+ClF(g)C

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.

Though you may hate some customs in other countries, ______ , you must remember "Do in

Rome as Rome does". [ ]

A. likewise          

B. therefore          

C. otherwise      

D. anyway

构成牙的主体是（）。

A、牙骨质

B、牙釉质

C、牙本质

D、牙髓

“地平线”话题作文

【模拟文题】

阅读下面的文字，根据要求作文。

“地平线”，《现代汉语词典》解释为：“向水平方向望去，天跟地交界的线。”自然界的地平线只存在于极目望去的远处。如果你走过去，就会发现那里也是坎坷不平的，而地平线却仍在远处向你招手。这时，如果你再回望你的出发地，才发现原来坎坷不平的地方现在望去也是平展的。

生活上的“地平线”也只是理论意义上的，真正的“平坦”和“平直”只出现于心理上而不是脚下。请以“地平线”为话题，写一篇文章。

______ fired, your health care and other benefits will not be immediately cut off.

A．Would you be

B．Should you be

C．Could you be

D．Might you be