单项选择题

______, I picked up the phone and rang my sister in AustraliA．

A．Off impulse
B．On guard
C．Off guard
D．On impulse
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单项选择题
I don't______building the park near a jet-port, which might make people suffer from defective hearing.
A．subscribe to
B．ascribe to
C．describe to
D．contribute to
单项选择题
______to some parts of South America is still difficult, because parts of the continent are still covered with thick forests.
A．Orientation
B．Access
C．Procession
D．Voyage
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