单项选择题

It takes about 3651/4 days for the Earth to ______ around the Sun in its orbit.

A．rotate
B．roll
C．spin
D．revolve
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单项选择题
Let's go on a picnic this weekend,______
A．will we
B．shall we
C．would we
D．should we
单项选择题
The old couple tried to accuse their children of neglecting their ______ duties.
A．docile
B．tame
C．obedient
D．filial
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