题目内容
A big ____tigers die of human demand for their bones. (proportion)
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We are working with computer experts ____that such accidents do not happen again. (ensure)
This shelf holds 80 pairs of shoes with prices ____from $120 to $150. (range)
Mary, I think you’d better change into something more suitable for your job interview. ( )
项目盈亏平衡产销量越低，表明项目（ ）
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