单项选择题

How can a mother help the baby to cry less

A．Cuddle the baby until he is quiet.
B．Leave the baby alone.
C．Do not always attend to the baby.
D．Teach the baby not to cry.
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单项选择题
The main purpose of this passage is to ______.
A．teach children how to learn to produce and experience certain emotions
B．give the common reader a general description of two basic kinds of learning
C．give parents some advice on how to modify their children's emotions through learning
D．discuss with psychologists how positive and negative feelings are produced
单项选择题
Science is still ______ of the causes of many kinds of cancer.
A．ignorant
B．unconscious
C．conscious
D．informed
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