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问题 选择题

根据下图所示实验分析得出的结论中，不正确的是（　　）

A．甲烷燃烧生成二氧化碳和水B．铁能在氧气中燃烧C．白磷的着火点比红磷的低D．二氧化碳的密度比空气大，

不燃烧也不支持燃烧 

A．A

B．B

C．C

D．D

答案

答案：A

阅读理解

          Halloween falls on October 31st. It is one of the most favourite holidays for children in the USA. People dress up in costumes like a witch, a ghost or a skeleton (骷髅). The children go to houses to say "Trick or treat!" Long ago, if a child was not good, he or she would get a trick like having a stone in his or her bag instead of some candy. Nowadays(如今), no one gets tricks. All the children receive lots of candy. Parties are also popular in the evening. People go to parties in costumes and play different games. People also like listening to ghost stories and watching scary movies.

根据短文内容完成下列句子。

1. Halloween usually happens on_______.

2. It is one of the most favourite holidays for children in the_______.

3. The children go to houses to say_______ to get some candy.

4. Nowadays, all the children _______ lots of candy.

5. The best title of this passage is _______.

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多项选择题

若有限空间内有毒有害气体仍存在超标或有可能超标，这种情况下仍需要进入时，作业人员必须选择佩戴供压缩空气的（）进入有限空间内进行作业。

A、正压式空气呼吸器

B、过滤式防毒面具

C、长管式呼吸面具

D、紧急逃生呼吸器
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