Choose the correct answer A, B or C
21 According to John, what is the main advantage of space exploration?
A To supply resources for use on Earth.
B To find out more about the origins of our planet.
C To establish a colony for humans if Earth becomes uninhabitable.
Who expresses the following opinions?
C Both John and Susan
25 We should plan a trip to Mars even though it may not happen soon.
26 We may eventually colonise Mars.
27 The soil on Mars is highly toxic.
28 The soil on Mars contains materials we could use.
29 Spaceships cannot be totally protected from radiation.
30 It is possible that humans could form a base on Mars.