The aim of the study is to find new ways to The babies of the participants will be followed

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问题 The aim of the study is to find new ways to
The babies of the participants will be followed

选项 A、throughout their lives.
B、for more than two decades.
C、from birth to 21 months.
D、until they get married.

答案B

解析短文的第一段以及倒数第三段都说到，这些婴儿将从出生前一直被跟踪到21岁。

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