题干意思是因为警察采取了行动，布鲁塞尔的自杀爆炸者们不得不把袭击目 标定在市区。录音内容的意思是在布鲁塞尔发生的严重爆炸事件中，自杀爆炸者们 最初考虑要袭击的是一座核设施，但警察先发制人进行抓捕（ preemptive police arrests), 迫使自杀爆炸者将袭击目标改为市区。题干与录音内容意思一致，正确答案 为 A。解题需要把握题干中的had to aim at some downtown targets与录音中forced them to switch to downtown targets 的意思相同。

[重点难点]
理解had to 与 forced之间的同义关联。

[录音原文]
Suicide bombers who blew themselves up in the deadly Brussels bombings were originally considering an attack on a nuclear site, but preemptive police arrests forced them to switch to downtown targets. Six people have been arrested, as two suspects remain on the loose.