A responsive emergency alert system can significantly reduce casualties during natural disasters by warning residents within seconds.
一个反应灵敏的紧急警报系统能在自然灾害期间于数秒内警告居民，从而显著减少伤亡。
Which choice best defines “responsive”?
C — Reacting quickly and positively. “responsive” means reacting quickly and positively.
Which word means “reacting quickly and positively”?
C — responsive. “responsive” means reacting quickly and positively.
responsive — reacting quickly and positively. In Chinese: 反应灵敏的.
responsive is pronounced /rɪˈspɒnsɪv/.
A responsive emergency alert system can significantly reduce casualties during natural disasters by warning residents within seconds. (一个反应灵敏的紧急警报系统能在自然灾害期间于数秒内警告居民，从而显著减少伤亡。)
reactive, quick, sensitive — all close in meaning to responsive (reacting quickly and positively).
unresponsive, sluggish — each the opposite of responsive (reacting quickly and positively).
Yes. responsive is on the SAT Prep Basic list — the everyday academic words the SAT assumes you already have. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.