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Craft and StructureEasyMain purpose of a how-to explanation

Craft and Structure practice question

To test whether an egg is still fresh, place it in a bowl of water. A fresh egg sinks and lies flat; an older egg stands on end as the air pocket inside it grows; an egg that floats should be thrown away.

What is the main purpose of the text?

  1. A. To explain a simple method for judging an egg's freshness.Correct
  2. B. To argue that older eggs are unsafe to eat.
  3. C. To describe how air pockets form inside eggs.
  4. D. To compare the nutritional value of fresh and old eggs.

Answer: A. To explain a simple method for judging an egg's freshness.

The text gives a test and how to read its results. It is instruction, not argument.

Why the other answers are wrong

B. To argue that older eggs are unsafe to eat.
The text says only that a floating egg should be discarded; it doesn't argue about older eggs in general.
C. To describe how air pockets form inside eggs.
The air pocket is mentioned in passing to explain one result, not as the topic.
D. To compare the nutritional value of fresh and old eggs.
Nutrition never comes up.

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