To be distinguishable, an air mass must meet three requirements:
1 . It must be large. A typical air mass is more than 1600 kilometers (1000 miles) across and several kilometers deep.
2 . It must have uniform properties in the horizontal dimension. This means that at any given altitude in the mass, its physical characteristics—primarily temperature, humidity, and stability—are relatively homogeneous
3 . It must be a recognizable entity and travel as one. Thus, it must be distinct from the surrounding air, and when it moves, it must retain its original characteristics and not be torn apart by differences in airflow.
The purpose of the paragraph is
a. to inform the reader that the major characteristic of an air mass is its size.
b. to analyze how an air mass avoids being torn apart by differences in airflow.
c. to describe the characteristics an air mass must have and retain, in order to be distinguishable.
The tone of the paragraph is
a. skeptical. b. descriptive. c. pessimistic.
c. b
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Scrivete la forma corretta della preposizione necessaria. (Write the correct form of the preposition that you need.)
Insert all necessary commas in the following sentences. Using that area for a colorful setting he wrote some of his best material.
Fill in the blank(s) with the appropriate word(s).
Me siento muy incómoda cuando recibo un mensaje de un _____que quiere charlar conmigo. Pero, podría pasar horas charlando con mis amigos o mi familia por Internet.
A. contacto personal B. nombre de usuario C. desconocido D. conocido
Which of the following refers to a technical description?
a. Manufacturers use these to describe their products for patents, quality control, and sales. b. These describe a product in great detail, providing exact information about features, dimensions, power requirements, capacities, and other qualities. c. Naturalists, anthropologists, sociologists, and others use these to help them accurately describe people, animals, and places. d. Scientists and medical personnel describe what they observe in great detail, so they can measure changes in their patients’ conditions.