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.