下列物质与空气混合，接触到明火，有发生爆炸危险的是 ①氢气②汽油蒸气 ③面粉尘
题型：选择题
问题：
下列物质与空气混合，接触到明火，有发生爆炸危险的是 ①氢气②汽油蒸气 ③面粉尘 ④棉尘 ⑤天然气 [ ]
A.仅①
B.①②⑤
C.①②③⑤
D.①②③④⑤
题型：选择题
单词拼写(共10小题; 每小题0.5分, 满分5分)
小题1:The lady thinks her husband is very r________, because he is very honest and positive.
小题2:However, all hope was not lost. Many 
soldiers and volunteers came to r________ the survivors.
小题3:More than 100 passengers were i____________ in the traffic accident on July, 23 and they were sent to the nearest hospital in Wenzhou.
小题4:The people in the western part s____________ a lot from drought (干旱) this summer.
小题5:People are encouraged to take the public t_______________ instead of driving their cars to work to reduce air pollution.
小题6:He is as stubborn as a mule. Nobody can p______________ him to change his mind.
小题7: My roommate happens to have moved away so you can s_______________ the room with me.
小题8:It’s your strong determination and active a_____________ towards life that leads you to success.
小题9:Earthquake is a natural d_______________, which can not be forecast yet. As a result, it causes great losses.
小题10:Of the two famous athletes in dash(短跑), the former is lightning Usain Bolt from Jamaica(牙买加); the l____________ is Tyson Gay from America.