1 extraterrestrial life
2 establish communication
3 send communication signals
4 human race
5 technologically advanced
6 radio waves
b Use the phrases from Ex. 2a to complete the sentences.
1 My job at the Aeronautical Agency is to send communication signals through radar.
2 Some people believe that aliens have tried to establish communication.
3 Are other planets inhabited by extraterrestrial life?
4 Some of the most technologically advanced companies are located in the US.
5 Radio waves transmit information over millions of miles.
6 A major part of the science of biology is the study of the human race.