单选题 Gravity is one of those things we take completely for granted. And there are two things about it that we take for granted: the fact that it is always there, and the fact that it never changes. If the earth"s gravity were ever to change significantly, it would have a huge effect on nearly everything because so many things are designed around the current state of gravity.
Gravity is an attractive force between any two atoms. Let"s say you take two golf balls and place them on a table. There will be an incredibly slight gravitational attraction between the atoms in those two golf balls. If you use two massive pieces of lead and some amazingly precise instruments, you can actually measure an infinitesimal attraction between them. It is only when you get a gigantic number of atoms together, that the force of gravitational attraction is significant.
The reason why gravity on Earth never changes is the mass of the Earth never changes. A change in mass great enough to result in a change in gravity isn"t going to happen anytime soon.
But let"s ignore the physics and imagine that, suddenly there was no force of gravity on planet Earth. This would turn out to be a pretty bad day. We depend on gravity to hold so many things down—cars, people, furniture, pencils and papers on your desk, and so on. Everything would start floating. What"s more, two of the more important things held on the ground by gravity are the atmosphere and the water in the oceans, lakes and rivers. Without gravity, the air in the atmosphere would immediately leap into space. This is the problem the moon has— the moon doesn"t have enough gravity to keep an atmosphere around it, so it"s in a near vacuum. Without an atmosphere, any living thing would die immediately and anything liquid would boil away into space.
In other words, no one would last long if the planet didn"t have gravity.
If gravity were to suddenly double, it would be almost as bad, because everything would be twice as heavy. There would be big problems with anything structural. Houses, bridges, skyscrapers, table legs and so on are all sized for normal gravity. Most structures would collapse fairly quickly if you doubled the load on them,
What this answer shows you is just how integral gravity is to our world. We can"t live without it. It is one of the true constants in our lives.

单选题 What do we tend to think of gravity?

单选题 What does the word "infinitesimal" (Para. 2) mean?

单选题 What will happen if the gravity suddenly disappeared?

单选题 What would be greatly influenced if gravity were suddenly double?

单选题 What"s the author"s purpose of writing this passage?