The author thinks that outer space... 1. ...is dangerous because of asteroids. 2. ...is a source of important supplies. 3. ...is not studied properly. 4. ...should be colonized.
Средний уровеньЧисло
The author thinks that outer space... 1. ...is dangerous because of asteroids. 2. ...is a source of important supplies. 3. ...is not studied properly. 4. ...should be colonized.