请看图将下列句子补充完整，注意冠词的使用。1. What's this? It's ________________. 
2. What's this? It's ________________. 
3. What's that? It's ________________. 
4. What's that? It's ________________. 
5. What's that? It's ________________. 
试题答案
1. a watermelon / melon 2. an apple 3. an orange 4. a strawberry 5. a peach