سؤال إنجليزي للصف السابع في القراءة والاستيعاب

You might think that polar bears are white, but they actually have black skin! The light on the fur makes them look white! Male polar bears can be up to three metres long and weigh up to 800 kilograms. That's as much as about ten men! Polar bears can swim for days at a time. A female polar bear once swam for nine days, travelling over 687 kilometres!