龍騰B2R3課文

How high above Earth do astronauts live and work?

• 100 kilometers

• 600 kilometers

• 200 kilometers

• 400 kilometers

Why is gravity almost zero at the altitude where astronauts live?

• Because they are in a vacuum

• Because of the lack of atmosphere

• Because they are far from Earth's surface

• Because of the speed of the ISS

What is used to keep eating utensils in place in space?

• Velcro

• Magnets

• Glue

• Tape

Why are powdered condiments like salt and pepper not used in space?

• They can float and cause damage

• They are not allowed by NASA

• They are too heavy

• They are difficult to store

What form are space flavorings restricted to?

• Liquid

• Solid

• Gas

• Powder

Why do astronauts need to exercise more regularly than people on Earth?

• To compete with each other

• To avoid boredom

• To maintain muscle strength

• To pass time

What happens to body fluids in microgravity?

• They disappear

• They evaporate

• They freeze

• They gather in the upper body

How do astronauts prevent themselves from floating away while exercising?

• By using weights

• By holding onto handles

• By using magnetic shoes

• By tying themselves to equipment

How long do astronauts typically exercise each day?

• 1 hour

• 3 hours

• 2 hours

• 30 minutes

What must be done to astronauts' sleeping bags to prevent them from floating?

• They must be fixed to the cabin wall

• They must be filled with air

• They must be weighted

• They must be tied to the floor