找出下面单词中不同类的一个，把它的序号写到前面的括号里。（10分)
Why________read books? A．not to B．don't C．not
Teachers taught us________many ways. A．in B．at C．from
Her studies in Middle School________coming to an end. A．am B．is C．are
We should help________ animals. A．protect to B．protecting C．to protect
In winter，some birds________ the south. A．fly to B．flies to C．fly
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