用适当的词填空。 |
1. Dolly, the first cloned sheep died _______ lung disease in 2003. 2. Scientists can take DNA ______ one kind animal and put it ______ another kind of animal. 3. If you had a sister or brother _______ to you, how could your mother tell you apart? 4. What ________ people all over the world went to the moon? 5. Have you ever see a cow ________ horse's face? |