Choose the one word or phrase that best completes the sentence. Click on the letter (A), (B), (C), or D in the answer space provided.

Identify the one underlined word or phrase that must be changed in order for the sentence to be correct.

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While the ionosphere is a permanent layer of the atmosphere, its structure varies according to season, latitude, and solar active.

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The pulse that may be felt wherever an artery passes over a solid structure, such as a bone or cartilage.



 
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A telescope consists of a series of lenses and, often, mirrors capability of producing a magnified image and of collecting more light than the unaided eye.

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Canada began cultivation wheat intensively in 1910, which led to a demand for tools, machines, housing, and building supplies.

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In the early nineteenth century, the Cherokee nation of American Indians was adopted a written constitution based on that of the United States.

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Some ways in which lizards different from snakes are in having ear openings, moveable eyelids, and less flexible jaws.

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High interest rates can dampen an economy by making it more difficulty for consumers, businesses, and home buyers to secure loans.

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Marble is found in the core zones of younger mountain chains and in the roots exposed of the more eroded ancient mountain chains of the continental shields.

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Velocity may be uniform, in which case both speed and direction remain constant, or variable, in which case speed, direction, or both changes.

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The membership of an industrial union is composed of skilled, semiskilled, or unskilled workers in a particular workplaces, industry, or group of industries.

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While models of automobiles date back as far as the late 1600s, the 1880s seen the first commercial interest in the vehicle.

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Vitamins A and C and most of the B vitamins are retain in foods that have been canned.

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Bret Harte, which best-known works describe life in California in the mid-1800s, helped shape the literary movement called local-color writing.

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Over the course of history, much civilizations developed their own number systems.

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Placebos, inert chemical substances used in place of other drugs in research, act as controls to assure unbiased, statistically reliably results.

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17 A considerable portion of the energy available in world today is used for heating and cooling the buildings in which people live and work.
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18

A variation of collodion photography was the tintype, which captured images on a black or dark brown metal plate instead from on glass.

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19 The moose, the biggest all of deer, can move quickly and quietly through the forest in spite of its massive size.
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20 In 1899 Mary Elizabeth Brown donated hers collection of over 200 musical instruments to the Metropolitan Museum of Art.
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21

Sunspots are but one manifestation of solar activity related of the Sun's magnetic field.

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21

A large proportion of the guest rooms in resort areas, as well as in cities, are owners, operated, or managed by hotel chains.

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22 In the United States, the attorney general is a cabinet member in charge with the administration of the Department of Justice.
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23 When carbon is exposed to extremely pressure and intense heat in Earth's interior, it is transformed into the raw material for diamonds.
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24 The piranha, a predatory freshwater fish found only in South America, has powerful jaws and can be up to two feet, or 60 centimeters, in long.
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25

Four different types of remembering are ordinarily distinguished by psychologists: recollection, recall, recognize, and relearning.

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