Answer: A) It reinforces the idea of the United Nations’ strength and power.
Repetition is often used as a rhetorical device in order to emphasize an idea. It can also be used to provide more weight to a particular topic or to leave a long-lasting image in the listener's mind. In this case, the idea that Roosevelt is trying to emphasize is that the United Nations will strike again, because of its strength and power. By repeating the word "strike," he is making sure that the listener understands the extent of this promise and the power of the UN.
He harbors no negative feeling towards them yet views them as inferior to himself
I believe the answer you are looking for is A. beatifix:aesthete. Hope this helps!
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~Steve
Duncan addresses the crowd with "sons, kinsmen, thanes" (1.4), and in his final speech Malcolm repeats the greeting by saying "my thanes and kinsmen" (5.8), the echoing of this address shows that Malcolm holds the same level of respect and care for his people as his father did. He welcomes everyone into his speech--as Duncan did earlier--and makes it clear that he appreciates and respects each of them by increasing their titles. Duncan in the beginning similarly showed his appreciation to Macbeth, Banquo, and Malcolm--by giving more titles to Macbeth, jewels to Banquo, and the title of "Prince of Cumberland" to Malcolm. The way that they handle the traitor (the Thane of Cawdor first and then Macbeth at the end) also is similar. They make it clear that they had trusted those men, but that those who fell into their evil or ran from them will not be punished. This shows more of how caring and kind they are in their position as king.
Malcolm's speech unifies the play in a couple of ways. Thematically we get to see that theme of power, ambition, and fate vs free will come full circle. Malcolm was named next for the throne, and then Macbeth derailed that through the course of the play by trying to take his fate into his own hands. Malcolm's speech as he becomes king shows that his position was inevitable and that power and ambition can only get a character so far before he falls. King was always going to be Malcolm's fate, it just took longer for that to happen.