Picky tastes? Large scars(疤) on faces? Something we don't worry about in our daily life may be big problems for astronauts!
To be an astronaut, you need to be:
• between 25 and 35 years old.
• 160 to 172 cm tall.
• 55 - 70 kg.
Besides, if you want to take this job, you need to take some hard tests at the same time.
Test 1 Stand strong g - forces(重力).
Usually, people can stand g - forces of 3 G to 4 G. But astronauts need to stand forces of up to 8 G. That is to say, their body feels eight times heavier than usual. They can feel bad. Tears run from their eyes and they can't breathe.
Test 2 Keep a good balance.
Astronauts train by sitting on a fast - spinning chair or a big “swing” for 15 minutes. Sometimes, they can feel sick.
Test 3 Be ready for the weightless(失重) environment.
To create a weightless environment on Earth, astronauts train inside a water tank. There, they stay afloat (漂浮的) while moving around or carrying tools. Every time, they train in the tank for six hours. After training, some of them are even too tired to hold a book.

(　　　) 1. What kind of person can be an astronaut according to the passage?
A. He has to be older than 23 years old.
B. He has some large scars on faces.
C. He weighs between 55 kg and 70 kg.
D. He needs to have a height of 180 cm.
(　　　) 2. How does an astronaut train to keep a good balance?
A. He moves around a big chair.
B. He stays in a water tank to keep afloat.
C. He stands g - forces of up to 8 G.
D. He sits on a big “swing” for 15 minutes.
(　　　) 3. What may happen to astronauts while training?
A. They can stay fit and healthy.
B. They may be in a bad condition.
C. They become heavier than usual.
D. They can't see anything for a while.

Exercise 2
四、1 - 3 CDB