四、阅读短文，从方框中选出能填入文中空白处的最佳选项，选项中有两项为多余选项
In Australia, there is a famous island (岛屿) called Fraser Island. A lot of visitors come here for holidays every year. Why? The reason is that it is special. In fact, it is the largest sand island in the world.
Though the island is a popular place of interest, there is no airport (机场) on the island. The long beach along the east coast works as the airport.
On the island, there are sand hills without any plants, but there are also forests with old trees, beautiful flowers and over a hundred lakes too.
Every year, visitors come to enjoy the island's natural beauty. People like camping and hiking there. Animals are killed for food and this makes them in danger. Visitors also throw rubbish everywhere, and the lakes are not so clean.
Rules have been set up. For example, visitors are not allowed (允许) to use motorboats or go fishing in the lakes, and they mustn't leave any rubbish.
A. Planes arrive and leave from here.
B. The whole island is made of sand.
C. Visitors enjoy themselves on the island.
D. They also relax on the beautiful beach.
E. Many kinds of birds and animals live in the forest.
F. Unluckily, visitors have caused (导致) many problems.
G. So it is time to protect the environment (环境) of the island.
28. 29. 30. 31. 32.