How are waterlogging and salinization related？
A. Salinization occurs only where waterlogging is a problem．
B. Waterlogging raises and concentrates salts near the surface．
C. Farmers add salts to irrigation water as a way to fertilize soil．
D. Both waterlogging and salinization contribute to soil erosion．
查看答案
Why does the author mention corn and wheat yields in paragraph 7？
A. To illustrate the effect of a small amount of erosion
B. To explain why erosion affects only certain crops
C. To describe the result of a shift from traditional practices
D. To show how poor management influences crop yields
Why does the author mention words, gestures, and pictures in paragraph 2？
A. To list things that are used in experiments with children
B. To give examples of symbols that children can understand
C. To compare different ways of illustrating a child's experience
D. To illustrate the concept of conservation of quantity
Traditional recruiting providers didn't make strategic progress because
A. they adopted new ways to help companies.
B. the solutions focused on project.
C. they didn't find customers.
D. they had no access to best practices and innovative techniques.
The phrase set up in paragraph 6 is closest in meaning to
A. forbid
B. establish
C. increase
D. conceal
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