D 选词填空
从方框中选择适当的词并用其正确形式填空，使短文完整、通顺。
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Tornadoes are strong winds that move quickly in a circle. They can be weak, strong, or very strong. Most tornadoes are weak. The weak 1. look like a rope hanging down from the sky. The wind in these moves at 177 kilometres per 2. or less. Some tornadoes are strong. They are wider at the top and
3. near the ground. The wind in these moves between 177 and 322 kilometres per hour. A few tornadoes 4. very strong. These tornadoes can break a wooden house. Tornadoes can happen anytime, 5. most happen between March and July. It is difficult 6. when a tornado will happen. This makes them more 7. .
If you hear that a tornado is coming, find a safe place like a cellar(地下室) or a tornado shelter. If you can’t find these places, stay in 8. room on the bottom floor. Stay away 9. windows and doors. If you are driving, don’t 10. in the car. Get out and find a shelter. If you can’t find one, lie down in a ditch(沟渠).

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