Which uses a formal tone most appropriate to a research paper?

dr. roscoe's work sheds new light upon the life cycle of the silkworm.

we are so lucky to benefit from dr. roscoe's work on the life cycle of the silkworm.

i think dr. roscoe is the most important researcher to study the silkworm in twenty years.

dr. roscoe's groundbreaking work on the silkworm stunned all of us in the research community.

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Read the following passage "you're not here to read books, you're here to learn! " the childwrangler's voice screeched as we kept our picks moving rhythmically against the school walls. we had all heard about a time, back in the dark ages, when children read books at school. they say school was even a building above ground. but that was obviously dangerous. how could society thrive if all the children sat around reading all day? when would they have time to learn about veins of coal, processing fuel, and all that stuff? school was important.what two central ideas in this story are most closely related? a. the importance of literature and the dangers of miningb. humankind's basic survival needs and independence c. the nature of learning and societal dysfunctiond. the powers of rumors and abuse of authority

What is the effect of narrator's word choice on the tone of this passage? the words "my heart shrank within itself" create a fearful tone. the words "better-omened" set a hopeful tone. the words "wounded his fellow" develop a remorseful tone. the words "struck harsh upon my ears" suggest an irritated tone.

Why does the narrator come to the house of usher