Answer:
D. Senator McKee, I am writing to humbly request your presence at our Harper Middle School Honors Bunch, the annual event where we celebrate our students and eat some delicious food. I know how busy you are, but if you could find the time to attend, everyone would be grateful.
Answer:
1. preview the main points
2. reinforce the central idea
Answer:
To point out the effect of a black hole on a star
