IELTS-G 14 Listening test 4 section 4 Questions 31-40

had a semicircle of large stones round a 31

research carried out into structures, 32 and human remains

used in the oil industry, e.g. to make 33

problems: they were expensive and 34

Marzamemi, Sicily: found ancient Roman ships carrying architectural elements made of 35

36 is used for short distance communication, acoustic waves for long distance

AUV can send data to another AUV that has better 37 ,for example

one carrying 38 supplies;

tablets may have been used for cleaning the 39

others carrying containers of olive oil or 40