题目内容
（请给出正确答案）
提问人：网友l******8
发布时间：2022年4月14日 23:13
[单项选择题]
Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given ...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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