[填空题]Compared with the dry, oxidized soil in Moscow, the water-logged soil in Novgorod is favorable to ________.

[填空题]The ground should not be too wet or too dry. The ground should be neither too wet ______ too dry.

[单项选择]Just as the soil is a part of the earth, ______ the atmosphere.
A. as it is
B. the same is
C. so is
D. and equally is

[简答题]
1 Soil is a renewable resource, but only on a very long time scale, as it takes hundreds or thousands of years for the natural processes of erosion, organic decay, and accumulation to create soils．Soil quality and the potential to produce crops can vary enormously from region to region and among various soil types．
2 One important factor affecting the productivity of soils ever time is agriculture．Top-quality lands are brought into production earlier because of their higher potential to produce food．As more and more land has been brought under agricultural production, the average quality of land has decreased, reducing potential productivity per hectare．Crops deplete soil fertility by consuming nutrients, and this eventually reduces crop yields．Poor management practices lead to soil compaction and soil pollution as well as loss of soil cover．Without proper management and the constant addition of nutrients and e

[单项选择]
1 Soil is a renewable resource, but only on a very long time scale, as it takes hundreds or thousands of years for the natural processes of erosion, organic decay, and accumulation to create soils．Soil quality and the potential to produce crops can vary enormously from region to region and among various soil types．
2 One important factor affecting the productivity of soils ever time is agriculture．Top-quality lands are brought into production earlier because of their higher potential to produce food．As more and more land has been brought under agricultural production, the average quality of land has decreased, reducing potential productivity per hectare．Crops deplete soil fertility by consuming nutrients, and this eventually reduces crop yields．Poor management practices lead to soil compaction and soil pollution as well as loss of soil cover．Without proper management and the constant addition of nutrients and energ
A. poor agricultural management
B. rotation of annual crops
C. accumulation of salts
D. lack of water drainage

[简答题]When Chekhov entered the Moscow University Medical School in 1879, he started to publish hundreds of comic short stories to support his family.

[简答题]

Th细胞