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【多选题】
下列行为不能引起不当得利之债的有（ ）。A.
养子女给付生父母赡养费用
B.
明知不欠他人欠款而为给付
C.
提前偿还所欠他人债务
D.
为履行合同而支付对方金钱，后该合同被确认为无效
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【简答题】写出所缺字母。 __ix __pples e__ght __ooks three __hairs __even __rees __en __oses __ine __eys
【简答题】教师劳动的特点有哪些？
【简答题】The ogy of 'cooking a lobster in a pot' illustrate that in a slowly changing environment ______ .
【单选题】This article is mainly aimed at drawing public attention to the condition of the environment，which is only getting worse over time.
A.
这篇文章的主要目的是使公众对日益糟糕的环境给予关注。
B.
这篇文章的主要目的是使公众对糟糕的环境给予越来越多的关注。
C.
这篇文章的主要目的是把公众对日益糟糕的环境勾画出来。
D.
这篇文章很糟糕，主要目的是使公众移开对环境的关注。
【单选题】题: 在三投影面体系中,正平面________于正立投影面、________于水平投影面、________于侧立投影面。
A.
平行/平行/垂直
B.
平行/垂直/垂直
C.
倾斜/平行/垂直
D.
垂直/平行/平行
【单选题】听力原文： Ecology is the study of the interrelationship of living things to their environment. This even includes the study of nonliving things. In recent years, ecology has become a source of great inter...
A.
Living things.
B.
Living things and nonliving things.
C.
The environmental problems caused by industry and people.
D.
The interrelationship of living things to their environment.
【单选题】Trevo Rees-Jones has come to Paris to______
A.
receive medical treatment
B.
conduct the inquiry
C.
answer the judge's inquiries
D.
investigate the accident
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