The author's attitude toward space colonization is ______.

A．a manned reusable orbital transfer vehicle is being manufactured
B．many people from the earth will move to the moon and live there by 3000
C．man will go to the moon to build space shuttles
D．STS is the first step to build space settlements

A．space industrialization will create new markets and more jobs on Earth
B．space exploration will be harmful to man
C．space colonization is near at hand
D．otherwise technologists will catch the opportunity to go to space