填空题

Copernicus (哥白尼) discovered an important (true)（）when he learnt that the earth moves round the sun.

【参考答案】

truth
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It is (evidence)（）that this attempt was a failure.
单项选择题
What is the probable relationship between the two speakers（）

A．Mother and son.
B．Teacher and student.
C．Husband and wife.
D．Boss and clerk.
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