Many families were broken up and their members were killed in the caused by the earthquake inYaan.
A. chaos
B. chains
C. plains
D. masses
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(答案→)A. chaos
B. chains
C. plains
D. masses
解析：考查名词辨析。A混乱B链条；C平原；D民众，大众；句意：我和家庭都破裂了，他们的家人在雅安第地震中所导致的混乱中北杀死了。根据句意说明A正确。