Key: E

Detailed analysis: The passage gives an overview of polar bears: their color and size, where they live, the environment (snow/ice/water), physical features, swimming ability, food, behavior, and a note about hunting and protection. Because it covers many aspects briefly, the main idea is a brief description of polar bears.

Main-idea test: A main idea should cover the whole passage \(\gt\) “brief description” includes location, body, abilities, food, and human actions.

Option analysis:

A. Too narrow; size is only one detail.

B. Also narrow; location is important but not the whole passage.

C. Close, but the text also discusses size, abilities, food, and hunting; so habitat alone is \(\lt\) overall description.

D. Only discussed in the last paragraph, not the main topic.

E. Best choice because it summarizes all main points.

Key: E

Detailed analysis: The last paragraph explains human actions: people like to kill polar bears for their coats, and governments now forbid killing them to prevent extinction. The central point begins with the reason for hunting (their beautiful white coats), and the ban is a response to that problem. Therefore the main idea is that polar bears are hunted for their coats.

Idea focus: Reason (coats) \(\gt\) consequence (hunting) \(\gt\) response (government ban).

Option analysis:

A–D are about physical facts and location, which belong to the first paragraph, not the last.

E matches the last paragraph’s main point and is \(\gt\) the others for relevance.

Key: D

Detailed analysis: The passage states that polar bears “go into the sea when they are afraid,” not when they are angry. Therefore the statement about being angry is not true according to the text.

Text comparison: “afraid” \(\gt\) mentioned; “angry” \(\lt\) not mentioned and changes the meaning.

Option analysis:

A. True; the text says they weigh 450 kilos.

B. True; the text says they are three meters long.

C. True; the text says they catch fish and sea animals for food.

D. Not true; it contradicts the stated reason (afraid).

E. True; the text says they can swim 120 kilometers out into the water.

Key: C

Detailed analysis: “Afraid” means feeling fear. The closest synonym among the choices is “scared.” This is \(\gt\) “shy” (timid) and \(\lt\) unrelated emotions like “angry/furious.”

Option analysis:

A. shy: timid/embarrassed, not the same as fear.

B. angry: opposite emotion.

C. scared: direct synonym of “afraid.”

D. furious: very angry, not fear.

E. shocked: surprised/astonished, not the same as being afraid.