下列属于原索动物的有：（ ）
A. 文昌鱼
B. 河蚌
C. 海鞘
D. 海参
[音频]Listen to the dialogue again, and then choose the best answer.1. Where does the conversation take place?
At the woman’s home.
B. At the man’s home.
C. On campus.
2. The two speakers _______.
A. haven’t met each other for a long time
B. met each other only yesterday
C. met each other last year
3. How’s the woman doing?
A. She hasn’t got used to the life here.
B. She has made a lot of friends.
C. She has had a nice trip to Beijing.
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