2. 外语
  3. When farmers______their crops with chemicals, excess phosphorus can wash into rivers and lakes.

When farmers______their crops with chemicals, excess phosphorus can wash into rivers and lakes.

admin2019-07-01  66
问题 When farmers______their crops with chemicals, excess phosphorus can wash into rivers and lakes.
选项 A、fertile
B、fertilize
C、fertilization
D、fertility
答案B
解析 The first clause needs a verb: fertilize.
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