What can we know from Principal 2's words？
A. The teacher will try their best to solve the problem.
B. The teachers have no ways to solve the problem.
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What might the attitude of boys’ father be to Mrs. Cohen’s talking?
A. He might think Mrs. Cohen's words are important.
B. He might think Mrs. Cohen will waste his time.
What does Mrs. Cohen think of the meaning of "bad parenting”?
A. She thinks that the phrase—bad parenting—is actually a support to her.
B. She thinks that they attribute the main reason of bad parenting to her.
According to Mrs. Cohen, what can she do now?
A. There is nothing she can do.
B. She can cure Brad by reading medical books.
低碳钢轴向拉伸试验的应力-应变曲线中测得的工程应力比实际应力（）
A. 大
B. 小
C. 相等
D. 无法确定
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