Complete the summary below.Choose NO MORE THAN THREE WORDS from the passage for

游客2024-01-08  10

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. [br] 【D1】

选项

答案 hot-air balloon

解析 利用细节信息“taking photographs”定位于原文段落C.的第二和第三句话“Hewalked over the entire site holding the balloon and taking photos.Then one afternoon,herented a hot-air balloon and floated over the site,taking yet more pictures”。这里“floatover the site”对应题目的“from a distance”,所以正确答案为hot-air balloon。
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