Africa is famous for deserts. There are not     46     (much) trees and forests. In order to bring life to the dry lands and help to fight the bad environment, eleven countries are building a great wall of trees around Africa. It is called the Great Green Wall.

The wall is 8,000 kilometers long and 15 kilometers wide. It covers from Senegal in the west to Djibouti in the east, on the south of the Sahara Desert (撒哈拉沙漠). So far, Senegal has made the best progress by     47     (plant) about 11,000,000 trees.

    48     (more) years ago, there were     49     (fewer) trees in that area and the winds used to be very strong. It was harmful to the fields. Also, there was     50     (less) rain, so few crops could grow and many people went hungry. But now, more and     51     (many) trees are being planted. And the trees today provide food     52     the local people and increase the wetness of the air.     53     (little) by little, there are green fields for people to grow crops so local people can have     54     (much) food to eat.

The project which began     55     (few) years ago may cost a total of 8 billion dollars. Many countries are trying their best to help to continue the planting. So we will be able to see the whole green wall across Africa in the near future.

Dear friends, do you like lakes? Welcome to Xining. And please have a t    56     to the Qinghai Lake. The Qinghai Lake is not very far away from Xining City. It is a great lake in China. Every year lots of v    57     come here for its natural beauty, blue water and green grassland(草原). I    58     you want to come, please come in summer. It’s the best time to visit this place. The weather is s    59     and there are lots of cows and sheep on the green grassland. You can watch beautiful flowers and different birds. You can also r    60     a horse on Haixin Mountain. You will love this beautiful place.