题目内容
The drill 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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题目内容
The drill in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental _____ and severe cold.
A.concerns
B.assumption
C.occupations
D.ignorance