根据无因管理之债的构成要件，下列事实中，不构成无因管理之债的事实是 ()
A. 未受委托，雇人为邻居的危险房屋加固，以免遭台风袭击倒塌
B. 受委托，雇人为他人照顾病人
C. 抢救溺水儿童
D. 饲养他人失散的动物并寻找主人
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听力原文：W: Did you go to see the football match？
M: Oh, yes. It was supposed to start at 2: 30. But it was delayed 15 minutes.
Q: When did the football match start？
(4)
At 1: 35.
B. At 2: 45.
C. At 4: 45.
D. At 3: 15.
What is NOT an advantage for a scholar to travel according to the passage？
A. He can gain recognition for his achievements from others of the same field.
B. He can get to know what others are working on.
C. He will waste a lot of his precious time.
D. He is quite likely to find a person with whom he can work.
What is NOT the cause of the recent explosion in academic movement？
A. Many scholars like to find an isolated place in a remote area so that they can concentrate on their researches.
B. Planes can take scholars here and there.
C. There are more people working in similar fields than before.
D. There are more learning centres than before.
What is this lecture mainly about？
An overview of fuel cell technology
B. A process for producing fuel cells
C. A comparison of fuel cell models
D. Some problems in fuel cell distribution
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