Science has told us so much about the moon that it is fairly easy to imagine what it would be like to get there. It is certainly not a friendly place. Since there is no air or water, there can be no life of any kind. There is not much variety of scenery cither. For mile after mile there are only flat plains of dust with mountains around them. Above, the sun and stars shine in the black sky. If you step out of the mountain shadow, it means moving from the severe cold into intense(强烈的)heat. These extreme temperatures continually break rocks away from the surface of the mountains. The moon is also a very silent world, for sound waves can only travel through air. But beyond the broken horizon, you see a friendly sight. Our earth is shining more brightly than the stars. From this distance, it looks like an immense(巨大的)blue, green and brown ball.

1. Without ______, the moon is a silent world.

A man       B air        C sound       D water

2. According to the passage we know that _______.

A   the earth looks like a coloured ball  

B   we can enjoy the scenery on the moon

C   every inch of the moon is very hot

D the extreme temperature breaks rocks away form the surface of mountains

3. We can conclude that ＂continually＂means ____.

A sometimes B always C without break D frequently

4. The best title for passage is ＂________＂.

A An Unfriendly and Friendly Place   B The Geography of the Moon

C Moon, a Silent World                D The Moon