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

What happened in scientific circles after the Curies had completed the final step

A．Scientists used deductive reasoning to test their investigations,
B．Scientists were concerned with probability in their investigations.
C．Scientists read their reports and examined their investigations.
D．Scientists were critical of their investigations.

单项选择题

Which of the following is the most important in the steps in the scientific method

A．Collecting and organising the facts.
B．Stating a hypothesis.
C．Testing the hypothesis,
D．Publishing the theory.