单项选择题

You will three dialogues or monologues. Before listening to each one, you will have 5 seconds to read the questions related to it. While listening, answer each question by choosing A, B, C or D. After listening, you will have 10 seconds to read your answer. You will hear each piece only once. Questions 11~13 are based on the following passage. You now have 15 seconds to read questions 11~13. What is the main topic of this talk

A.Proteins.
B.Low-quality protins.
C.Poor dietary habits.
D.Healthy diets.
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