单项选择题

A．Study a weather map.
B．Visit a weather station.
C．Watch a weather report.
D．Go to a storm shelter.
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单项选择题
A．Brain.B．Heart.C．Brain and muscle.D．Brain and heart.
A．Brain.
B．Heart.
C．Brain and muscle.
D．Brain and heart.
单项选择题
The hydra is a kind of ________.
A．flatworm
B．coelenterate
C．sea anemone
D．nerve cell
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