单项选择题
The （）of a city is the fight to protect it from those who attack it.
A.commandB.captureC.destructionD.defense
单项选择题 In Wellington the houses are （）fairly thinly over a number of hills.
单项选择题 In his lecture Prof Smith has （）a wide range of subjects.
单项选择题 （）the lake around our university was seriously polluted.
