D. To use scientific models since computing is more reliable.

　　答案解析：答案为C。本题为细节题。从第三段 “…farmers can use remote sensors to measure how much water their crop is actually using.” 可知答案为C。本题容易错选D项。题干问的是 “农民如何得到关于庄稼的新信息？” 从第二段最后一句话 “But if they had better information, they could use scientific models to compute more precisely how much water their crop is using.” 可知，农民如果有了更好的信息可以使用scientific models。故答案D错误。

　　3. What do farmers check upon when they decide how much water each crop needs?

　　A. Profitability.

　　B. Remote sensors.

　　C. The cost.

　　D. Air temperature.

　　答案解析：答案为D。本题为细节理解题。从第四段 “Moran believes that if farmers are getting good and timely measurements of plant and air temperature, then they can program when and how much water to give each crop through an irrigation system.”可知，农民依靠准确及时地测量植物和空气温度，来决定给每种庄稼配给相应的水分。 故答案为D。

　　4. What's the purpose of Moran introducing the study she carried out in Arizona?

　　A. To investigate the use of remote sensing data.

　　B. To support her viewpoint in the previous paragraph.

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