Which do you think is ________ city, Beijing, Chongqing or Chen du?

A. more beautiful B. the most beautiful C. the more beautiful D. most beautiful

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A spacesuit is much more than a set of clothes astronauts wear on spacewalks. A full spacesuit is really a one-person spacecraft. The spacesuit protects the astronaut from the dangers of being outside in space.

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Spacesuits also provide astronauts with O2 to breathe while they are in the space. They contain water to drink during spacewalks. They protect astronauts from being hit by a small object in space. It may not sound very dangerous, but when even the small object is moving many times faster than a bullet, it can cause injury. Spacesuits also protect astronauts from radiation(輻射) in space. The suits even have parts to protect astronauts’ eyes from the bright sunlight.

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Water moves through these tubes to keep the astronaut cool during the spacewalk. On the back of the spacesuit is a backpack. This backpack provides the O2 that astronauts breathe during a spacewalk. It also takes CO2 away. The backpack also provides electricity for the suit. A fan moves the O2 through the spacesuit and life support systems, and a water tank holds the cooling water that moves through the cooling device.

Another device called the Simplified Aid for Extravehicular Activity Rescue, or SAFER is necessary. If an astronaut became separated from the space station, he or she could use SAFER to fly back.

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