单项选择题

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20. How can sharks find their quarries

A．By good sense of water waves made by quarries.
B．By good sense of smell and electrical and magnetic power.
C．By good sense of light.
D．By good sense of blood.

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单项选择题

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.

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.

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20. How can sharks find their quarries 您的浏览器不支持 audio 元素。

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20. How can sharks find their quarries