科研之友
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<正>I. Look at the pictures and fill in the blanks.1. What are these boys doing?They are_______.2. Look at this frog. What is it doing?It is_______.3. Look. This is not a rabbit. It is a dog.What is it doing?It_______ _______.4. Look at this boy. Is he singing?No, he isn’t. He is_______a book.
