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Tiểu Cầm Posted 13 years ago
Vocabulary

Help me solve this question

Q: Drinking water ______ excessive amounts of fluorides may leave a stained or mottled effect on the enamel of teeth.
A. containing B. including C. made up of D. composed of
I think A, C or D are similar. A is past participle form, C or D are present participle form. But the correction is A. I don't understand. Please explain it to me. Thanks!
  

Top answer

"made up of" and "composed of" have to do with constituent parts (parts that form a substance). For example, hydrogen and oxygen atoms make up water. You can equally say that water is composed of hydrogen and oxygen atoms or H2O molecules.

— Ivanhr

  • "made up of" and "composed of" have to do with constituent parts (parts that form a substance).
  • For example, hydrogen and oxygen atoms make up water.
  • You can equally say that water is composed of hydrogen and oxygen atoms or H2O molecules.
  • Fluorides, on the other hand, don't make up water.
  • They can simply appear in it as dissolved substance(s) or possibly in some other form.
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2 Answers
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"made up of" and "composed of" have to do with constituent parts (parts that form a substance). For example, hydrogen and oxygen atoms make up water. You can equally say that water is composed of hydrogen and oxygen atoms or H2O molecules.

Fluorides, on the other hand, don't make up water. They can simply appear in it as dissolved substance(s) or possibly in some other form. This is why
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Drinking water having / which has excessive amounts of fluorides may leave a stained or mottled effect on the enamel of teeth. (containing = having)

Hence, the answer 'containing' is correct.

made up of -- The table is made of wood. (Wood is the material used to make the table.)
composed of -- Water is composed of hydrogen, oxygen and rare gases. It is not
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