把所选项前面的A、B、 C或D填在空格中即可。 Passage 2—The Threat of Terrorism Questions 19 to 21 are based on the following passage. extremist n. /ɪkˈstriːmɪst/极端主义者;极端分子; fragile adj. /ˈfrædʒaɪl/ adj. 不牢固的;脆弱的 be prone to 易于遭受 unsuspecting adj. /ˌʌnsəˈspektɪŋ/ 毫不怀疑的;无危险意识的;无戒备心的 instability n. /ˌɪnstəˈbɪləti/ 不稳定 第一空()19. A)Threat of global nuclear attack. B) Threat of climate change. C)Threat of terrorist attacks. D)Threat of a world war. 第二空()20. A)In their own country. B) In the strongest countries. C)In the western countries. D)In the weakest countries. 第三空()21. A)Play a positive role to make our world safe and secure. B)Join the army to fight terrorists. C)Take action when we suspect a person to be a terrorist. D)Become more aware of threats.