单项选择题

Which of the following questions might the Curies NOT ask in their investigations

A．What was radiation exactly
B．What materials might have radioactivity
C．How could man avoid powerful radioactivity
D．How strong is the radioactivity of radium

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单项选择题

Changing one's losing streak means______.

A．doing transactional analysis
B．becoming more like a winner
C．learning new psychological approaches
D．getting rid of bad habits

单项选择题

In the section of Winners , the authors' objective is to______.

A．convince the reader that winning is important
B．describe the nature of winning and achieving
C．state the characteristics of a winning person.
D．explain how to be a winner