astronaut mystery explore equipment typically select mentally intelligence procedure high

（1）It is exciting and challenging to explore the

mysteries

mysteries

of the universe.
（2）The achievements in space

exploration

exploration

really inspires humans to go further.
（3）If you want to be an astronaut，you must be

intelligent

intelligent

enough and get a related college degree first.
（4）It is quite a complex

procedure

procedure

to select suitable persons as astronauts.
（5）After the complex selection procedure，astronauts have to learn to use space

equipment

equipment

.
（6）It is necessary for astronauts to receive much physical and

mental

mental

training.
（7）It is

typical

typical

of astronauts to have 1，350 hours of flying experience to become a qualified one.
（8）After

being selected

being selected

to attend pilot training，Yang Liwei worked hard to meet all the requirements.
（9）Here are special requirements for the

height

height

of astronauts.That is to say，they should not be too tall or too short.
（10）An

astronaut

astronaut

is a person whose job involves travelling and working in a space- craft.