The drilling in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental and severe cold.
A. concerns
B. assumption
C. occupations
D. ignorance
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(答案→)A. concerns
B. assumption
C. occupations
D. ignorance
解析：concern关系，关心；assumption假定，设想；occupation职业；ignorance无知。句意：在南极的勘探工作进行的很慢，是因为缺乏资金、设备出了故障、环境关系及天气寒冷。根据句意故选A。