单项选择题

What kept early people from understanding the sea().

A. They could not think.
B. They had no pollution.
C. They could not dive deep.
D. They had small boats.

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What do the man and the woman agree most on().

A. Celebrities as role models.
B. Interest in celebrities.
C. Inspirational values of celebrities.
D. The entertainment value of celebrities.
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What does the speaker say is burned at the beginning of exercise().

A. Carbohydrates.
B. Indirect fat.
C. Body fluid.
D. Fat.
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