2. 外语
  3. Complete the summary below. Choose NO MORE THAN THREE WORDS from the passage for each answer. Write your answers in boxes 18-25

Complete the summary below. Choose NO MORE THAN THREE WORDS from the passage for each answer. Write your answers in boxes 18-25

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问题 Complete the summary below.
Choose NO MORE THAN THREE WORDS from the passage for each answer.
Write your answers in boxes 18-25 on your answer sheet.
Exploring the ancient city of Pteria
Archaeologists began working ten years ago. They started by taking photographs of the site from the ground and then from a distance in a【D1】______. They focused on what lay below the surface using a magnetometer, which identifies variations in the magnetic field. These variations occur when the【D2】______in buried structures have changed direction as a result of great heat. They line up with the surrounding magnetic field just as a【D3】______would do.
The other remote-sensing technique employed was resistivity. This uses a【D4】______ to fire electrical pulses into the earth. The principle is that building materials like【D5】______and stone do not conduct electricity well, while【D6】______does this much more effectively. This technique is mainly employed during the【D7】______, when conditions are more favourable. Resistivity is mainly being used to【D8】______ some images generated by the magnetometer.
【D3】
选项
答案compass/compass needle
解析
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