单项选择题

A．Cries of birds are affected by seasons.
B．Only some sorts of birds can cry.
C．Birds would cry when they meet dangers.
D．It is easy to tell the singing of a bird from its crying.
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单项选择题
A．sourceB．originC．resourceD．base
A．source
B．origin
C．resource
D．base
单项选择题
A．Plant some rose bushes in the yard.B．Cut some fresh flowers.C．Visit the park.D．Talk to someone who has visited the park.
A．Plant some rose bushes in the yard.
B．Cut some fresh flowers.
C．Visit the park.
D．Talk to someone who has visited the park.
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