What does the topic sentence do?

The “big dig” the “big dig” (the central artery/tunnel project) has been complex and challenging. located in boston, massachusetts, this tunnel is eight lanes wide and three-and-a-half miles long. what is most amazing about this tunnel is that it is constructed under a major highway and skyscrapers located in boston’s financial district. construction crews used “clamshell excavators” during this dig. these machines carved narrow trenches, and then a special substance was pumped into the trench to keep the dirt from caving in. finally, steel beams were lowered into the trench and concrete was pumped in. one problem that engineers faced while constructing the tunnel is the fact that the soil beneath boston is extremely loose and soggy. engineers solved this dilemma by freezing the soil and pumping very cold water into pipes beneath the city. to strengthen the soil even further, a special type of glue was injected into the ground to with the consolidation of the soil. 23 which phrase best defines the word excavator as used in the passage? a. a device used to measure underground temperatures b. a device used to level uneven surfaces c. a device used to move heavy objects d. a device used to dig holes

Ineed . identify the item that shows sharp and vivid details rather than vague and general ones (put a or b for your answer.) a. my brother doesn’t know the value of money. he buys new things, even though his old ones are still perfectly good. he recently took his girlfriend on a trip. they stayed at a nice hotel and ate all their meals out. while they were there, he proposed marriage to her and gave her an engagement ring. b. my brother bought a new car this year, even though his last car was only three years old and running well. he recently took his girlfriend to hawaii for a week. they stayed at a hilton hotel right on the beach and ate dinner by candlelight in elegant gourmet restaurants. on their last night there, he surprised her with a two-carat diamond ring.

What is one example of a word/phrase choice that may affect how people think about a particular social problem?