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
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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