单项选择题

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单项选择题
All kinds of environment-sensors are designed to ______.
A．watch for signs of trouble
B．do what a vigilant driver can do
C．do what a vigilant driver can’t do
D．watch for signs of trouble out of sight
单项选择题
A．Large green jellyfish.B．Different floating plants.C．Oceanic snails.D．Sunken treasure.
A．Large green jellyfish.
B．Different floating plants.
C．Oceanic snails.
D．Sunken treasure.
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