Why is it imprtant for neswpapers to understand their readers backround knowledge about an event

I will do my best to answer even though there are no answer choices...

The whole point of newspapers is to be read. If no one is reading their newspapers, they make no money.

Therefor, it is important for the newspaper company to understand the background information known so that they can sell their newspapers to readers. If the readers do not understand the newspaper, they will be less likely to buy it because they will not find it interesting.

Hope it helps! :p

tending to cause harm

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).