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阅读下面短文,在空白处填入 1 个适当的单词或括号内单词的正确形式。

In late April 2014, a 1. (violence) storm swept through the southern United States, destroying more than $ 1 billion in property and killing 35 people. But a group of migratory(迁徙的) birds in eastern Tennessee sensed the oncoming mess and left long before  the  first  clouds  arrived.  A  year 2. (early),  the  team  had  tagged golden-winged  warblers  ( 莺 )  with  leg  trackers 3. (study)  their  annual migrations to South America. Two days before the storms 4. (strike),five golden-winged warblers slipped away, traveling nearly 700 kilometers south to the Florida coast.

It's the first time that the birds which normally migrate with the seasons 5. (observe) to slip away when a big storm hits. The researchers suspect this 6. (behave) occurs only when the threat of injury outweighs the energy costs of a long trip. But nobody knows 7. the birds guessed the storm's severity and left so soon. Puzzled by it, the scientists initially reasoned that delicate changes in weather — atmospheric   pressure,   temperature,   wind   speed,   cloud   cover,   or  rainfall   signaled 8. upcoming disaster. Yet when they checked weather records, none of these factors waved significantly 9. the storm. Instead, the team assumes that the 10. (approach) storms created a disorder of infrasounds—low-frequency sound waves that birds can hear, but humans can't.

高三英语语法填空中等难度题

少年,再来一题如何?
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