单项选择题
When a professor gives students ______ instructions， the instructions are generally easily understood．
A．clear－cut
B．blurry
C．marginal
D．ambiguous
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单项选择题
Katie’s parents never see her as the mothering type but when her son was born she took to it like a _____ to water．
A．shrimp
B．horse
C．duck
D．dog
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单项选择题
What’s the cause of demonstrations in cities and towns across Syria
A．They are calling for more freedom．
B．Workers demand higher pay．
C．Some thirty people were killed by the police．
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