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.
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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.
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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