Radar is very important in aviation today. It was first introduced in the Second World War. The British used it in the great air battles over England in 1940. The British fighter planes had to be in exactly the right place at exactly the right time to meet the enemy bombers. In order to get there, the fighter stations had to be warned long before the bombers actually appeared. They also had to know the course the bombers were following. This would have been impossible without radar.

(87 words)

　　What is the passage mainly about?
　　 A) The invention of radar.　　　　
　　 B) The importance of radar in war.　　　　
　　 C) The first radar used in war.　　　
　　 D) The importance of radar in aviation today.　　　　

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