There are some things that may help slow down global warming and help delay extinction(灭绝) of polar bears. These include finding new energy sources that don't give off greenhouse gases and not making any more incursions on polar bear territory.
66. What is the main idea of the passage?
A. Why should we save polar bears?
B. How can we save polar bears?
C. Where can we find polar bears?
D. When will polar bears die out?
67. Which of the following is NOT the cause threatening the survival of polar bears?
A. Habitat loss.
B. Global warming.
C. Cold weather.
D. Lack of food.
68. The underlined word “carnivores” refers to ______.
A. grasseating animals
B. meateating animals
C. polar bears
D. Arctic seals
69. It is estimated that by the middle of the 21st century we will probably have lost ______.
A. most of polar bears
B. few of polar bears
B. all of polar bears
D. half of polar bears
70. We can infer that ______.
A. using solar energy can help save polar bears
B. drilling for oil in the Arctic should be encouraged
C. polar bears can surely adapt to changing climates
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