شرکت در آزمون آنلاین انگلیسی 3 - انگلیسی 3 | آزمون شماره 11802

Earth is the third planet from the Sun and it is the only planet known to have life on it. Earth formed around 4.5 billion years ago. It is one of the four rocky planets on the inside of the Solar System. The other three are Mercury, Venus, and Mars.

The large mass of the Sun makes Earth move around it, just as the mass of Earth makes the Moon move around it. Earth also turns round in space, so different parts face the Sun at different times. Earth goes around the Sun once (one “year”) for every 365¼ times it turns all the way around (one “day”). The Moon goes around Earth about every 27⅓ days, and reflects light from the Sun. As Earth goes round the Sun at the same time, the changing light of the Moon takes about 29½ days to go from dark to bright to dark again. That is where the idea of “month” came from. However, now most months have 30 or 31 days, so they fit into one year.

Earth is the only planet in our Solar System that has a large amount of liquid water. About 71% of the surface of Earth is covered by oceans. Because of this, it is sometimes called the “Blue Planet”. Because of its water, Earth is the home to millions of species of plants and animals. The things that live on Earth have changed its surface greatly. For example, early cyanobacteria changed the air and gave it oxygen. The living part of Earth’s surface is called the“biosphere”. 

?What is the main idea of the passage

At first, the struggle our group didn’t give up … to be useless, but later it turned out to be efficient.