Researchers from Clemson and the University of Pennsylvania selected 13,000 people very carefully for their study. A: 正确 B: 错误
Researchers from Clemson and the University of Pennsylvania selected 13,000 people very carefully for their study. A: 正确 B: 错误
中国大学MOOC: Researchers from Clemson and the University of Pennsylvania selected 13,000 people very carefully for their study.
中国大学MOOC: Researchers from Clemson and the University of Pennsylvania selected 13,000 people very carefully for their study.
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