Lesson 61

1. By moving the radar¹ beam around slowly in circles, we can _____ the surroundings.       
   A. explore   B. expose   C. exploit   D. addle

<addle>
addle  混乱的、糊涂的
addle egg  变坏了的蛋
</addle>

<explore>
explore  开发、研究、探索
</explore>

<expose>
expose  暴露
</expose>

<exploit>
exploit  开发、剥削
explode  爆炸
lodestar  北极星
the exploited  被剥削者
</exploit>

1 radar   

n.雷达，无线电探测器

参考例句：

• They are following the flight of an aircraft by radar.他们正在用雷达追踪一架飞机的飞行。
• Enemy ships were detected on the radar.敌舰的影像已显现在雷达上。