This question is based on the following paragraph. the sentences are numbered to you answer the question.

(1) scientists generally agree that earth is getting warmer due to what's called the greenhouse effect. (2) a greenhouse stays warm because sunlight and heat coming through the glass roof are mostly trapped. (3) the heat doesn't radiate back into the atmosphere because it's held in by the glass. (4) something like that happens on earth. (5) the atmosphere acts like a blanket that keeps the sun's heat from leaking away into space.

which sentence is the paragraph's topic sentence?

a. sentence 5
b. sentence 3
c. sentence 2
d. sentence 1

Ineed . read the passage, and choose the three (3) inferences that are most firmly based on the given information. your sister has a new boyfriend. the first time you meet him, he corners you and talks to you for an hour about football, a subject in which you have no interest at all. you come away with the impression that he is an inconsiderate bore. the next two times you see him, however, he says not a word about football. he participates in the general conversation and makes some witty and intelligent remarks. what is your impression of him now? do you find him likable and interesting on the basis of the last two encounters? do you average out the early minus and the later plus and come out with a neutral zero? neither is likely. what is likely is that you still think of him as an inconsiderate bore. psychological research suggests that first impressions, as our mothers and fathers told us, are quite lasting. 1. the words “neutral zero” refer to an impression that is positive. 2. the words “neutral zero” refer to an impression that is neither positivenor negative. 3. the selection suggests that it’s a good idea to make good firstimpressions. 4. the selection suggests that it can be difficult to remain objective aboutothers. 5. first impressions tend to be fair and balance