托福听力official31 According to paragraph 4, which of the following is true of waterlogged soils? 答案解析

用 waterlogged soil 去定位，发现这一段的前三句话都在描述这类土壤的特性：Waterlogged soils occur in areas that are flat or have poor drainage. These soils usually contain large amounts of clay and easily become water saturated. Air cannot penetrate between the soil particles, making the soil oxygen-poor.第三句话中的 oxygen-poor 对应 C 选项的 little oxygen。所以 C 为正确选项。A 对于“by contrast…”那一句，描述的是 sandy soil 的特性，并不是 waterlogged soils 的特性。B 与原文矛盾，上段最后就说要么很干要么很湿，waterlogged 就是很湿的那种。D 对应“Sandy soils are prone to …..”,描述的也是 sandy soil 的特性，所以错。