A. Answer the questions about On Thin Ice.

(Trả lời các câu hỏi về On Thin Ice)

1. What is the main idea of the article?

a. Polar bears are amazing swimmers.

b. Arctic temperatures are rising.

c. Global warming is endangering polar bears.

2. Why was the polar bear that Nicklen saw swimming unlucky?

a. It fell in the water.

b. It was on an ice floe.

c. lt had to swim farther.

3. How do polar bears hunt seals?

a. They wait on ice floes.

b. They wait in the water.

c. They drown the seals.

4. In line 13, “a rare sight” means something that ___.

a. is horrible to look at

b. you don't see often

c. is blind

5. Polar bears ________.

a. won't have any food in 2050

b. will all die before 2050

c. are struggling to find food