单项选择题

Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now, listen to the conversation.
Why do people need to do arm exercises

A．Because their arms are too fat.
B．Because their arms are too flabby.
C．Because arm exercises can help lower the blood pressure.
D．Because arm exercises can keep them healthy.

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There is no reason they should limit how much vitamin you take, ______ they can limit how much water you drink.

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Physics is the present-day equivalent of ______ used to be called natural philosophy, from which most of present-day science arose.

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Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation. Why do people need to do arm exercises 您的浏览器不支持 audio 元素。

Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now, listen to the conversation.
Why do people need to do arm exercises