We can utilize water for producing electri

.Water and air are _______ to human beings. We can

A．We can invent ways of increasing rainfall.B．We can develop ways of reusing water and

What can we learn about the American film industry around 1920？A．Art films produced in Ame

We can infer from the passage that______.A．when put into water, nanaoparticles are highly

According to the passage, a large population can produce a chance for the development ofA．

We can t emphasize ______ the importance of air and water for the survival of all species.