短语讲解：

1. The incident shows how neighbors have helped each other in response to the recent flooding in Baton Rouge and nearby communities.

in response to 对…做出反应
例句：He opened the door in response to a knock.
他应敲门声而开了门。

2. Thousands of people are homeless.

thousands of 数千的
例句：A computer consists of thousands of components.
电脑由成千上万个部件组成。

3. They spoke to a young African-American man, who was helping his father clean out his flooded home.

clean out 打扫; 离开; 肃清
例句：You must clean out the remainder of Germany.
你们必须扫荡残余之德军。