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The word proliferation in paragraph 3 is closest in meaning to

A. style
B. expense
C. control
D. spread

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Look at the four squares,A ,B ,C , and D, which indicate where the following sentence could be added to the passage．Where would the sentence best fit？
Unless they are flushed or drained from the soil, their buildup may cause a number of serious problems．
One of the most critical soil quality problems related to irrigation is the increase in concentration of dissolved salts．This process, salinization, affects an estimated one-fourth of the world's irrigated cropland．In some places, irrigation water contains as much as 3.5 tons of salt per 1, 000 cubic meters．A As the water flows over and through the ground, it dissolves salts, increasing the salinity of the water．B Since some crops require 6, 000 to 10, 000 cubic meters of water per hectare, land can receive tens of tons of salt per hectare．C As the water evaporates, high concentrations of salts such as sodium chloride are left behind in the topsoil．D Salt buildup can stunt crop growth, decrease yields, kill crop plants, and eventually make the land unproductive．

What led to Helge Ingstad's discovery at L'Anse aux Meadows in the 1960s？

A. The account of Vinland's wild grapes in the sagas
B. The search for a favorable place for a colony
C. The idea that Vinland referred to a meadow
D. The interest in writing about a haunted place

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According to the passage, how did the electronic era get its name？

A. Electronics became a standard subject taught in schools．
B. The discovery of electrons occurred during the period．
C. Writers of the period predicted the invention of computers．
D. The technology sent electrical signals along electrical wires．

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Which sentence below best expresses the essential information in the highlighted sentence

A. The scientific study of soils is improving soil quality in many regions worldwide．
B. Few people would disagree that soil quality is as diminished as scientists say it is．
C. The number of scientists who specialize in the study of soils has been decreasing．
D. Most scientists agree that soil degradation is occurring in many parts of the world．

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The word proliferation in paragraph 3 is closest in meaning to

A. style B. expense C. control D. spread

What led to Helge Ingstad's discovery at L'Anse aux Meadows in the 1960s？

According to the passage, how did the electronic era get its name？

Which sentence below best expresses the essential information in the highlighted sentence

A. style
B. expense
C. control
D. spread