单项选择题

The passage is mainly about______.

A．nuclear weapons
B．biological weapons
C．chemical weapons
D．bio-chemical weapons
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单项选择题
The phrase radiation so strong it cracks glass (line 4, paragraph 2) means______.
A．glass is too strong to be destroyed
B．radiation can cause glass to be broken
C．radiation is not strong enough to break glass
D．bacterium can break glass easily
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