his kind of weather between February and May, while March and April see the most frequent and the _62_ (strong) sand storms. It es a very important environmental problem. It does lots of harm _63_ the society as well as the environment. Firstly, the strong wind destroys soil and plant cover by _64_ (bury) fields with sand and dust. Secondly, by leaving too much dust in the air it will _65_ (serious) pollute the air. Thirdly, a sand storm will have _66_ bad effect on transportation. The dust in the air makes traffic and aircraft movements more difficult. And when the sand buries the roads, the traffic will _67_ (block) . When plants in the farmland are buried, food supply will lose.РSand storms are another _68_ (punish) nature gives to mankind. We should not only take effective measures _69
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