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. It’s actually the brain that’s the problem. When you’re on the phone, your brain can’t focus as much on driving. Then you’re 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.

1. read the following excerpt from franklin d. roosevelt's "fireside chat 19":

on the other side of the picture, we must learn also to know that guerilla warfare against the germans in, let us say serbia or norway, us; that a successful russian offensive against the germans us; and that british successes on land or sea in any part of the world strengthen our hands.

remember always that germany and italy, regardless of any formal declaration of war, consider themselves at war with the united states at this moment just as much as they consider themselves at war with britain or russia. and germany puts all the other republics of the americas into the same category of enemies. the people of our sister republics of this hemisphere can be honored by that fact.  

the true goal we seek is far above and beyond the ugly field of battle. when we resort to force, as now we must, we are determined that this force shall be directed toward ultimate good as well as against immediate evil. we americans are not destroyers — we are builders.

analyze the effectiveness of this excerpt. how does it function within the speech as a whole? how does the structure of the excerpt to convey the speech's purpose and key points? support your argument with evidence from the speech. (10 points)