66. What does this article imply about Churchill?
A. It's located in a very remote area.
B. It's attracting fewer tourists now.
C. It's surrounded by smaller towns.
D. It's dependent on the oil industry.
67. What does this article explain about polar bears?
A. The ways in which they threaten people
B. The most important elements of their diets
C. The mating behavior that they exhibit
D. The time of year when they give birth
68. How is the polar bears' seal winter hunting season changing?
A. It's starting earlier.
B. It's becoming colder.
C. It's finishing later.
D. It's getting shorter.
69. What can we learn about polar bears from this article?
A. How they avoid traffic accidents
B. How they learn good habits from one another
C. How they're endangered by pollution
D. How they find a hiding place during bad weather
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