【单选题】【消耗次数：1】
The birth rate of the country decreases ______ with years.
①
extremely
②
approximately
③
progressively
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相关题目
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The city ____ its birth-rate by almost 60% in the past 20 years.
①
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【单选题】
The city ______ its birth-rate by almost 60% in the past 20 years.
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随机题目
【多选题】
计算加权算术平均数，在选择权数时应具备的条件是?
①
权数与标志值相乘能够构成标志总量
②
权数必须表现为标志值的直接承担者
③
权数必须是总体单位数
④
权数与标志值相乘具有经济意义
⑤
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