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  3. Anyone who sees a special type of airplane with its turning wings knows it is a helicopter’s. One of the helicopter’s most impor

Anyone who sees a special type of airplane with its turning wings knows it is a helicopter’s. One of the helicopter’s most impor

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问题     Anyone who sees a special type of airplane with its turning wings knows it is a helicopter’s. One of the helicopter’s most important【B1】______is its ability to fly as slowly as it likes. It can do more than that. It can move【B2】______,【B3】______and sideways. It can also stay in the air without【B4】______at all. Above all it can move up and down in a completely【B5】______line: the ability to take off and land is the most【B6】______For in this way it can deliver goods and【B7】______to places which could not possibly be reached by【B8】______planes, It can land in a very small field. It can land on a road or on a small ship.【B9】______They are used for loading ships and for building things of all kinds. The big oil companies use them for sending supplies to men scathing for oil under the sea.【B10】______Every day somewhere in the world lives are saved by helicopters.【B11】______Ordinary airplanes cannot land in the center of cities. Helicopters can. In New York, there is a helicopter service between the three big airports. London, too, has one to connect with London Airport. This could have a very important effect on air travel in Britain.
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