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Part II Passages (每题2分, 共20分)
Direction: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. The passage will be read only once. After you hear a passage, you must choose the best answer from the four choices marked A), B), C) and D).
Passage One
Questions 11 to 13 are based on the passage you have just heard.
11.What does the professor say about the element in the body?
Ideally, there should be different amounts of each.
B .
The amount of each in the body is not very important.
C .
They can be out of balance.
D .
Different people have different elements.
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