单项选择题

Slotin did not call the hospital for help until ______.

A．the screwdriver slipped
B．a chain reaction began
C．he apologized to his co-workers
D．he calmly handled the accident
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单项选择题
How many people were involved in the experiment giving rise to radioactivity
A．Seven.
B．Eight.
C．Nine.
D．Ten.
单项选择题
What is the main point of the passage
A．To warn people of the dangers of atomic power.
B．To describe the heroism of Louis Slotin.
C．To make a statement about what morality means.
D．To express the author's view of a scientist's duty.
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