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■ TOEFL 09/03/01

Minerals are nutrients that exist in the body and in food organic and inorganic combinations. All tissues and internal fluids living things contain varying quantities of them. "They" are constituents of bones, teeth, soft tissue, muscle, blood, and nerve cells. They are important factors in maintaining physiological processes, strengthening skeletal structure, and preserving the vigor of the heart and brain as well as all muscle and nerve systems.

Look at the word "They" in the passage. Click on the word or phrase in that "They" refers to.

注: Quotation marksに入っているTHEYは試験では網掛けになっています。

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