Question

select the correct text in the passage
which sentence shows the main idea of the passage?
we all know that driving while talking on a cell phone is dangerous. but did you know that driving while talking on a hands - free phone can be just as dangerous? many studies have found that talking on a hands - free phone can increase the chances of an accident. most people misunderstand the cause of cell phone driving accidents. they believe that using your hands to hold the phone while driving is the problem. its actually the brain thats the problem. when youre on the phone, your brain cant focus as much on driving. then youre more likely to have an accident. a study by carnegie mellon university showed that just listening to someone else talk on a phone caused a 37 percent drop in concentration among drivers

Explanation:

The passage starts by stating that driving while talking on a cell phone is dangerous and then introduces that driving while talking on a hands - free phone is also dangerous. The following sentences explain the reason (brain focus issue) and provide a study as evidence. The first sentence "We all know that driving while talking on a cell phone is dangerous. But did you know that driving while talking on a hands - free phone can be just as dangerous?" sets the main topic.

Answer:

We all know that driving while talking on a cell phone is dangerous. But did you know that driving while talking on a hands - free phone can be just as dangerous?