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  3. The texture of the soil depends on the relative amounts of different-sized particles that combine to make up the soil. These par

The texture of the soil depends on the relative amounts of different-sized particles that combine to make up the soil. These par

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问题     The texture of the soil depends on the relative amounts of different-sized particles that combine to make up the soil. These particles can be as large as stone and gravel or as small as clay.
    A typical clay soil is composed of approximately 60 percent actual clay, 20 percent silt, and 20 percent sand. The particles in a sandy soil are so fine that it tends to be compact and interferes with the oxygen supply for plant roots. Water has trouble entering this impervious soil, and runoff is very common during rainfalls.
    A typical light sandy soil is composed of approximately 70 percent sand, 20 percent silt, and 10 percent clay. The particles in a sandy soil are comparatively large, permitting water to enter the soil and to pass through it so quickly that it often carries nutrients with it and dries out very rapidly. The texture of sandy soils is generally very difficult to modify because huge amounts of organic material must be added.
    A typical loam soil is composed of approximately 40 percent sand, 40 percent silt, and 20 percent clay, making it an ideal garden soil. It is easily worked and retains water and nutrients, which are slowly absorbed by plant roots.
    A typical adobe soil is a clay soil present in hot, dry areas of the country and is often very hard and cracked. It has all the disadvantages of a heavy clay soil and, being much drier, is more difficult to correct.
It can be inferred from the passage that the most distinguishing characteristic of adobe soil is ______.
选项 A、its color
B、the texture of its surface
C、the size of the soil particles
D、the number of nutrients present
答案B
解析 最后一段说，制土砖的土很硬而且易碎。它具有所有重黏土的不利条件，由于比其他黏土干燥，因此更难中和。
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