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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单项选择题

We can conclude from the last paragraph that______.

A．scientists will lose the war against diseases
B．scientists will generally win the war over the bacterium
C．scientists will be defeated in the war over the bacterium
D．scientists will win the war over the bacterium completely

单项选择题

The passage is mainly about______.

A．nuclear weapons
B．biological weapons
C．chemical weapons
D．bio-chemical weapons