Question

1. read this passage, looking for clues about its text structure.

sloths are unique, intelligent, and endearing mammals. cousins to anteaters, they belong to two biological families: the two - toed sloth to the megalonychidae family and the three - toed sloth to the bradypodidae family. they originate from the jungles of central and south america, where they dwell in trees and live off of plant buds, shoots, and leaves. sloths come by their name honestly: they are extremely slow - moving creatures with low metabolic rates.
why does the author use bold print in this article?
○ to point out foreign terms
○ to stress the main ideas of the article
○ to indicate important but perhaps unfamiliar words
○ to show a topic change within the piece

Explanation:

The bolded terms in the passage (like the biological family names) are scientific/technical terms that are important for understanding sloths' classification but may be unfamiliar to readers. Option A is incorrect as they aren't foreign terms (they are scientific names, not from a foreign language context here). Option B: The bolded terms aren't the main ideas (main ideas are about sloths' uniqueness, origin, etc.), they are specific vocabulary. Option D: Bold doesn't show topic change here. So the correct reason is to indicate important but perhaps unfamiliar words.

Answer:

C. to indicate important but perhaps unfamiliar words