2015-07-21
448
preservation, dangerous, heating, sandstone, road, lining, cooling, safety, to drain, salt mine
1. Tunneling is difficult, expensive and … engineering work.
2. Temple on the Nile was built in … about 1250 B.C. for Ramses II. In the 1960’s it was cut apart and moved to higher ground for … before flooding from the Aswan High Dam.
3. Perhaps the largest tunnel in ancient times was a 4800 foot-long, 25 foot-wide, 30 foot-high … tunnel between Naples and Pozzuoli, executed in 36 B.C.
4. To save the need for a …, most ancient tunnels were located in reasonably strong rock. It was broken off by so called fire quenching, a method involving … the rock with fire and suddenly … in by dousing with water.
5. In A.D. 41 the Romans used some 30 000 men for 10 years to push a 3.5 mile (6 kilometers) tunnel … Lacus Fucinus.
6. Far more attention was paid to ventilation and … measures when workers were freemen, as shown by archaeological diggings at Hallstall, Austria, where … tunnels have been worked since 2500 B.C.
VII. Make the precis of the text
