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问题 单项选择题

施工现场会存在大量的电气焊、防水、切割等动火作业，这些动火作业，使施工现场具备了燃烧产生的另一个必备条件一（）

A.火源

B.氧气

C.可燃物

D.火花

答案

参考答案：A

填空题

从方框中所给的词中选出最恰当的10个是，用其适当的形式填空。第个词只限用一次。（每小题1分）

Everyone loves a good mystery,. For thousands of years, Cretan mazes(克里特岛迷宫)have小题1:us. There are many different ideas about why they first appeared, and it’s run to tryand work one out! From the outside~ a Cretan maze looks like any other. There is only one path (路径) to follow, but it's 小题2:to get lost! The earliest example of  this type of maze is on a clay tablet (泥板) 小题3:___________ in Greece around 1200 BC. 小题4:__ ____,            the most famous was built on the island of Crete. The ancient Greeks 小题5:________ that there was a monster in the first Cretan maze. lt was half-man, half-bull, and liked to 6小题6:______humans, Every few years 7 boys and 7 girls  Make  call impossible legend though mystery confuse however into eat believe

cry were gent 小题7:________the maze , where the monster killed them. Eventually, a brave prince(王子) 小题8:______ Theseus killed the monster.  This is a good story. But it’s just a 小题9:____________Today, Cretan mazes are all over the world, and still seem 小题10:___________ Whether you believe the story or just admire them as pretty  works of art, enjoy the fun they bring!
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填空题

光的速度是300 000 000米/秒，用科学记数法表示为______，那么光1小时所走的路程用科学记数法表示为______．
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