单项选择题

The author believes（）

A. walking is better than jogging
B. working up a good sweat is the best way
C. walking is one best exercise
D. over-exercising is the best way

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单项选择题
It can be inferred from the passage that foraminifers are a （）

A. kind of weather pattern
B. form of sea life
C. species of tundra plant
D. type of miniature penguin
单项选择题
According to the passage, which of the following can be found in areas with quite different climatic conditions on Earth（）

A. Reef corals.
B. Penguins.
C. Bears.
D. Camels.
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