单选题
Listen to the conversation and circle the appropriate letter.
单选题
Which whales are not mentioned in the conversation?
【正确答案】
C
【答案解析】gibson： Finally, we finished our observation of whales today.
jane： Don’t be happy until we accomplish all our jobs.
gibson： As you mention it, I do remember. Have you finished our survey form of watching whales?
jane： No. We watched killer whales, blue whales and sei whales today...
gibson： And how is the sight? Have you filled in? You always forget that.
jane： Ah, thanks to your reminding. Eh...the visibility was about 50 metres, I think.
gibson： Come on, when we were watching, we could see as far as 100 metres.
jane： Maybe you’re right. You know, I’m not clear about that exact number every time.
单选题
The visibility of that day was __________ metres.