People start to question some nutrients effect probably because______.
A. the experiments on mice have failed
B. they may affect brain development
C. mothers" diet can influence children
D. they may disrupt normal biological mechanisms
The author believes that it is important that spoken language______.
A. be learned at an early age
B. not be confused with body language
C. not be confused with written language
D. be learned in the context of a caring relationship
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