题目内容

The soldiers put up a strong________in order to protect their country.
A．performanceB．breakdown
C．defenceD．system
C
答案　C　[考查defence的用法。defence“保护；护卫”；performance“表演，演出”；breakdown“故障”；system“系统”。根据语境，可知C是恰当选项。句意：士兵们为了保卫祖国建立了一个很强的防守系统。]
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