单项选择题

Questions 11--13 are based on the following passage. You now have 15 seconds to read Questions 11--13. How can the group carry out their studies

A．By using satellite images, maps, etc.
B．By studying specific farming methods.
C．By studying the variation of human population.
D．By analyzing the quality of crops.

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单项选择题

How can the satellites catch the information about the soil

A．By turning the intensity of sunshine into maps;
B．By analyzing the recent weather report.
C．By capturing the microwave radiation from the soil.
D．By analyzing information provided by ground observation centers.

单项选择题

A．whichB．thatC．whatD．when

A．which
B．that
C．what
D．when

Questions 11--13 are based on the following passage. You now have 15 seconds to read Questions 11--13. How can the group carry out their studies 您的浏览器不支持 audio 元素。

Questions 11--13 are based on the following passage. You now have 15 seconds to read Questions 11--13. How can the group carry out their studies