单选题What is the main idea of the passage?ASalt is very important.BIf their blood salt level is not constant, human beings may die.CThe amount of salt in the body is secreted.DPeople can die of thirst.
单选题
What is the main idea of the passage?
A
Salt is very important.
B
If their blood salt level is not constant, human beings may die.
C
The amount of salt in the body is secreted.
D
People can die of thirst.
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