单项选择题

Which of the following can help with fluid retention

A．Vitamin B-6.
B．Calories.
C．Magnesium.
D．Calcium.
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Country life differs from city life in that a sense of community generally ______ the inhabitants of small villages together.
A．combines
B．links
C．binds
D．ties
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Clearly, if we ______ in the class we must communicate with our classmates.
A．participate
B．are to participate
C．will participate
D．do participate
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