单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．Industrial specifications.
B．Computer development.
C．Scientific drawings.
D．Science fiction.
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单项选择题
A．Attend the birthday party.B．Miss the birthday party.C．Go home before birthday party.D．Feel unhappy at the party.
A．Attend the birthday party.
B．Miss the birthday party.
C．Go home before birthday party.
D．Feel unhappy at the party.
填空题
Praise, if too much can lead to an unexpected effect opposite to out intention.
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