A、50 minutes. B、30 minutes. C、25 minutes. D、15 minutes. A考查对时间的理解。对话中提供了三个时间，现在是8：30，去机场需要半个小时，飞机9：50才起飞，因此他们到达机场后还有50分钟时间办理登机手续

M:Do you remember the film on space exploration that was on TV last week?
W:Sure, we watched it together. And it was virtually the most impressive one I’ve seen on that topic I would like to watch it again if I have time.
Q:What do we learn from the conversation?

M:It’s already eight thirty. We’ll have to hurry if we want to catch the flight.
W:Well, it takes only half an hour to get to the airport, and the plane doesn’t leave until nine fifty. We have plenty of time to check in.
Q:How much time would be left for the man and the woman to check in for the flight?