单项选择题

The British used radio waves because they______.

A．were more exact than sound waves
B．could not be discovered
C．could pass through fog and clouds
D．were easier to use than sound waves
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单项选择题
What caused the ban to be put on ivory trade by the UN
A．Legal killing of elephants.
B．Illegal killing of elephants.
C．Conservation and community development projects.
D．Elephants facing extinction.
单项选择题
What prevents Israeli and PLO negotiators from solving their problems
A．The fundamental differences between them.
B．Their reluctance to compromise.
C．Their desire to acquire more land.
D．Their unwillingness to talk to each other.
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