2. 外语
  3. Who voiced opposition to the use of pacifiers on infants? The cause of SIDS is______.

Who voiced opposition to the use of pacifiers on infants? The cause of SIDS is______.

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问题 Who voiced opposition to the use of pacifiers on infants?
The cause of SIDS is______.
选项 A、discovered by Canadian researchers.
B、still unknown.
C、bad sleeping positions.
D、maternal smoking.
答案B
解析
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