单项选择题

A．Because it’s shining.
B．Because it’s rare.
C．Because it’s expensive.
D．Because it came from ancient times.
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单项选择题
A．Grade all the homework.B．Clean the professor’s office.C．Help the professor in the classroom.D．Sort all the documents.
A．Grade all the homework.
B．Clean the professor’s office.
C．Help the professor in the classroom.
D．Sort all the documents.
单项选择题
A．Whether second hand smoking is liked with cancer.B．Whether active smoking is linked with cancer.C．Whether passive smoking by children is liked with childhood cancers.D．Whether an average degree of passive smoking is harmful.
A．Whether second hand smoking is liked with cancer.
B．Whether active smoking is linked with cancer.
C．Whether passive smoking by children is liked with childhood cancers.
D．Whether an average degree of passive smoking is harmful.
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