填空题

(science)（）have done countless experiments to show that praise is far more effective than criticism in improving human behavior.

【参考答案】

Scientists
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单项选择题
What do we know from the conversation（）

A．The man accepts her invitation.
B．The man doesn’t feel worried about the test.
C．The woman gives him some advice.
D．The woman is comforting him.
问答题
What has the prior speaker just pointed out
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