单项选择题

What is the main reason for citizens to take in hand the defence of themselves______

A．There are not enough policemen.
B．They do not trust the' rule of law.
C．The police force is inefficient.
D．Security devices do not work.
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单项选择题
The principal subject discussed in this passage is ______.
A．the bleak future for the oceans
B．the resources in the oceans
C．the environmental damage to the oceans
D．the climatic changes caused by ocean currents
单项选择题
The stars described in the passage are______.
A．shells that are put in a launcher
B．heavenly bodies in the sky
C．brilliant colors produced by fireworks
D．compressed chemical powder
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