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“保護(hù)；護(hù)衛(wèi)”；performance“表演，演出”；breakdown“故障”；system“系統(tǒng)”。根據(jù)語(yǔ)境，可知C是恰當(dāng)選項(xiàng)。句意：士兵們?yōu)榱吮Ｐl(wèi)祖國(guó)建立了一個(gè)很強(qiáng)的防守系統(tǒng)。]
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