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What can be inferred from paragraph 1 about cognitive development during the five-seven shift？

A. It is a time when children start learning in very simple ways．
B. It is the most important period in the child's formal education．
C. It is a topic of disagreement among child psychologists．
D. It is related to biological developments in the child's brain．

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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？
For instance, when sand is poured back and forth between containers of different sizes and shapes, the quantity of sand does not change．
Piaget discovered the most widely known hallmark of the five-seven shift, an understanding of conservation, the idea that some properties stay the same despite changes in appearance．A In one of Piaget's classic experiments on the conservation of quantity, the experimenter shows children of different ages two straight rows of coins, each with six coins pressed close together, beside each other on a table．B The experimenter asks each child subject whether both rows have the same number of coins or whether one row has more．Then the experimenter spreads out the coins of one row to make the line look longer．C The child must now say whether one row has more coins．Children younger than five years old cannot understand conservation, so they invariably say that the spread-out row has more coins than the other row． D

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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．

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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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What can be inferred from paragraph 1 about cognitive development during the five-seven shift？

A. It is a time when children start learning in very simple ways． B. It is the most important period in the child's formal education． C. It is a topic of disagreement among child psychologists． D. It is related to biological developments in the child's brain．

The word proliferation in paragraph 3 is closest in meaning to

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

A. It is a time when children start learning in very simple ways．
B. It is the most important period in the child's formal education．
C. It is a topic of disagreement among child psychologists．
D. It is related to biological developments in the child's brain．