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You may think there is only sand in the desert(沙漠) of the world, __41__ it is not true. In the desert, as we know, there is a little __42__, but it is not __43__ for most plants. Still we can see some plants __44__ in the desert.
    There is __45__ in some places in the desert. We __46__ these places oases(綠洲). In the oases, there are villages and towns. People grow __47__ kinds of crops in the fields there.
People __48__ live outside the oases. They have camels, sheep and other animals. These animals depend on(依靠) the desert plants __49__ their food and do not need __50__ water.
    The __51__ are useful to the desert people in many ways. They eat the meat and drink the milk of the animals. They use the camels for carrying water, food, tents and something else.
The people of the desert have to keep moving from place to place. They must always look __52__ grass or desert plants for their animals. When there is no more food for their animals, they move to __53__ place. The desert people are __54__. People in the desert would be willing __55__ the people in trouble and give them food and water.

41. A. and             B. but                   C. or                    D. so
42. A. rain            B. rains                 C. wind                D. winds
43. A. good           B. good enough     C. enough good     D. enough
44. A. live             B. to live               C. lives                 D. lived
45. A. stones         B. plants               C. wood                      D. water
46. A. say             B. tell                   C. call                  D. find
47. A. every          B. all                    C. a                      D. one
48. A. also            B. too                   C. either                      D. still
49. A. for             B. on                    C. by                    D. with

50. A. a little         B. few                  C. much                      D. any
51. A. water          B. plants               C. crops                      D. animals
52. A. at                      B. for                   C. up                    D. after
53. A. other          B. the other           C. the others         D. another
54. A. well            B. friend               C. friendly            D. carefully
55. A. help            B. helps                C. helping             D. to help