C．Irrigation researches.

　　D．Over­irrigation.

　　解析：从文章第一段最后一句she says, farmers have a tendency to over irrigate可知。

　　答案：D

　　2．How can farmers get the new information about their crop?

　　A．To reschedule irrigation as required.

　　B．To watch weather changes regularly.

　　C．To use remote sensors as researchers suggest.

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

　　解析：从文章第三段farmers can use remote sensors to measure...可知。

　　答案：C

　　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.

　　解析：从文章第四段可知。

　　答案：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.

　　C．To show how farmers can reap a harvest.

　　D．To criticize those farmers who used too much water.

　　解析：从文章第五段第一句可知。

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