与宫缩乏力无关的是（）。
A.产妇精神过度紧张
B.待产时使用安定、杜冷丁注射液多次
C.子宫肌纤维变性
D.急产
E.滞产
参考答案：D
Mary often does some translation work to earn extra money, which ________ half of her income. [ ]
A. makes up
B. counts on
C. accounts for
D. consists in
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