扇贝有坚硬的外壳，所以它属于甲壳动物。

A: Hi, Jim. How was your weekend?
B: Wonderful. __小题1:_
A: Not bad . I phoned you at five o’clock yesterday
afternoon .  小题2: 
B: I was playing ping_pong with my friend at that time.
 小题3:  
A: I was chatting with my friends on the Internet.  We talked a lot about the ways of learning English.
B: Sounds great !
A: Yes. I phoned you and wanted you to join us.
B:小题4:. What did they say about that ?
A: One of my friends thinks: First , we should practice listening to English a lot. Then we should speak it out.
B: I quite agree . Please let me know next time..
A: 小题5:. Bye .    B :  Bye .

A: What a pity! B: What about yours? C: But nobody answered. D: What did you do yesterday afternoon . E: What were you doing yesterday afternoon . F: That’s great! G: No problem .