问题
选择题
The soldiers put up a strong________in order to protect their country.
A．performance
B．breakdown
C．defence
D．system
答案
答案：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。]