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What is the main topic of the video?

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According to the news about the flood in Hunan and Jiangxi, how many people were killed in the disaster?

According to the news about the flood in Hunan and Jiangxi, what were brought to those whose home were lost?

According to the speaker, what do English listening materials include?

下列属于妊娠期特有的心脏病是（）

A. 房间隔缺损
B. 心肌炎
C. 二尖瓣狭窄
D. 艾森门格综合征
E. 围产期心肌病