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Expression of Ideas / Rhetorical Synthesis Difficulty: Medium

While researching a topic, a student has taken the following notes:

  • In meteorology, an air mass is a large body of air with generally uniform humidity and temperature.
  • Air masses are commonly classified by two-letter names.
  • The first letter indicates the humidity of the air mass, while the second letter indicates the temperature.
  • cA (continental arctic) means dry and cold, for example.
  • mT (maritime tropical) means moist and warm.
  • This classification system is based on the work of a Swedish meteorologist named Tor Bergeron (1891–1977).

The student wants to provide an example of an air mass. Which choice most effectively uses relevant information from the notes to accomplish this goal?

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Explanation

Choice D is the best answer. The sentence provides an example of an air mass: the cA, or continental arctic, air mass.

Choice A is incorrect. The sentence provides a general definition of air masses; it doesn’t provide an example of a specific air mass. Choice B is incorrect. The sentence describes the system used to classify air masses; it doesn’t provide an example of a specific air mass. Choice C is incorrect. The sentence explains how air masses are classified; it doesn’t provide an example of a specific air mass.