选择合适的单词补全对话。
| A．sour | B．What | C．yum | D．pear E. sweet |
L: 1. _____ is this? Is it a pear?
M: No, it isn’t. It’s a strawberry.
L: What’s this? Is this a 2. _____?
M: Yes, it is. It’s a pear. It’s 3. _____.
L: Oooh, 4. _____!
L: What’s that?
M: It’s a lemon.
M: No! No!
L: Yuk! It’s 5. _____!
b. 
d. 
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