题目

    is a good idea to bring your camera because you may want to take photos of the autumn leaves.A．ThisB．ItC．ThatD．What 答案：B解析:考查代词的用法。当不定式短语较长时，通常用it作形式主语放在句首，将真正主语不定式结构放在句子后部。故选B。哺乳动物一般具有发达的皮毛，其作用是（　　）A．伪装B．保护C．防御D．保温