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　　People have been finding Moon rocks and Mars rocks at the South Pole．Why the South Pole? It seems that the South Pole (Antarctica) is a really good place to look for them and to find them．

　　Part of the reason for this is that Antarctica is a very large slab of ice sitting on a bed of rock. The ice doesn't stay still．It moves，ever so slowly，from the centre of Antarctica down to the coast (海岸)．

　　When meteorites (陨石) fall on the Antarctic ice，some stay on the surface but most get trapped 　 a few metres down．After all，they do come down with some force and heat!

　　The meteorites get caught up in the ice as they move to the sea and a few million years later most of them reach the coastine．

　　On the way to the sea some of the ice passes round mountain ranges where the meteorites get dislodged．In other words，the ice presses them to the surface．

　　Anywhere else on the earth the meteorites either land in the ocean or cover themselves underground in the soil，never to be seen again．

　　In Antarctica，the little black rocks show up very nicely against the white background.

People who live where there are trees and where there is a completely different climate aren't so lucky!

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仔细阅读下列短文, 根据题目, 选出最佳选项. On a warm day last summer, I was walking by the sea. The waves came and went. But I didn't see them. I was lost in my thoughts. A row of small holes soon caught my eyes. They lay in the sandy earth by the side of a road. In a minute I would have stepped on them. What are these holes I wanted to know. I had an answer soon. A fat, hairy insect(昆虫) climbed up from the earth. It had a wide tail. It was using the tail to dig in the ground. The insect moved round and round in one spot(地点). Soon it had made another hole. When it was finished, the insect itself hid in it. It covered its head with sand. By now my thoughts of the early morning had gone. This new hole and the insect were all my world. So I sat there by the side of the road. As I watched, a small ant(蚂蚁) crossed the road. It passed by my foot, and then it crossed the sandy earth. In a little while it reached the edge(边缘) of the road. I saw it start to fall in. The ant tried to turn back. But it couldn't. And then I knew why the holes were there. For just then the fat insect came up out of the hole. It ate the ant who was trapped(陷入圈套) there. Later I learned the insect's name. It's called ant lion. It digs holes to catch ants. I'll never forget that day. The holes looked so small to me. But to the ant and the ant lion, they were the whole world. I often took my walks by the sea that summer. But I never again learned as much.

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