Take a look at the picture! The question is what is the positive connotation of the phrase black gold rush in paragraph 2??

Which number is main idea? (1) someone once said, "seeing yourself as you want to be is the key to personal growth." (2) you can yourself grow in self-knowledge through the following exercises. (3) first of all, take the tombstone test. (4) what would you like to have written on your tombstone? (5) in other words, how would you like to be remembered? (6) your honest answer should reveal, in a few words, what you value most. (7) next, see if you can describe yourself, as you are today, in a brief sentence. (8) you might want to ask friends or family members how they would describe you in a few words. (9) then decide how you would have to change to become the person you want to be remembered as. (10) finally, try the adjective test. (11) choose three adjectives that you'd like to see connected with your name. (12) then list what you've done or can do to earn such a reputation.