| A.Global warming. | B.Pollution. |
| C.Hunting. | D.Travelling. |
| A.Polar bear fur is white. |
| B.Perhaps the writer will drive his car less. |
| C.It's harder for polar bears to find food in summer. |
| D.Polar bears left have a good, happy life. |
| A.勤劳的 | B.聪慧的 | C.普通的 | D.坚强的 |
| A.To show that the number of polar bears is getting smaller. |
| B.To tell people that polar bears will soon have nowhere to live. |
| C.To let people know why polar bears are in danger. |
| D.To talk about polar bears and suggest that people protect animals. |
| A.A magazine about animals. | B.A book about greetings. |
| C.A poster about working plans. | D.An instruction book. |