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【单选题】
局地湍涡是(),非局地湍涡是()。A.
尺度比较小,扩散运动只能影响附近的湍涡。尺度和混合层相当,可以实现物质从地表到混合层顶扩散的湍涡。
B.
尺度和混合层相当,可以实现物质从地表到混合层顶扩散的湍涡。尺度比较小,扩散运动只能影响附近的湍涡。
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【简答题】Today a new generation of sociologists continues to further study the puzzle of ______.
【单选题】According to Paragraph 2, a new study finds that______.
A.
learning a new language can benefit a lot when you grow old
B.
you have to learn a new language at a very young age
C.
picking up a new language have few benefits later in life
D.
picking up a new language can cause serious health problems
【多选题】已知由同种元素组成的不同种单质，互称为同素异形体。例如金刚石和石墨是同素异形体，红磷和白磷也是同素异形体。某同学查阅有关资料得知：铁有δ-Fe、γ-Fe、α-Fe三种同素异形体。三种晶体在不同温度下能发生以下转化。下列有关说法正确的是 [ ]
A.
构成它们的原子大小不同
B.
δ-Fe、γ-Fe、α-Fe之间的相互转化是化学变化。
C.
δ-Fe、γ-Fe、α-Fe一定由不同种类的铁原子构成
D.
δ-Fe、γ-Fe、α-Fe里铁原子的排列不同
【单选题】( ) is the study of the various aspects of the relation between language on the one hand and speakers and society on the other.
A.
Pragmatics
B.
Sociolinguistics
C.
Syntax
D.
Semantics
【简答题】A new study shows a relationship between fast walking and life expectancy. For this study, researchers looked at walking speed and other health factors for almost 35,000 older s. They followed th...
【简答题】Having a child may improve a woman’s memory, a new study suggests. In the study, women who were new mothers scored better on tests of visuospatial memory – the ability to understand and remember infor...
【单选题】听力原文： A new study from the University of New South Wales has discovered that during the working week, Australian fathers only spend an average of just over a minute each day alone with their children....
A.
France
B.
America
C.
Denmark
D.
Australia
【简答题】Moving to a new town or even a new neighborhood is stressful at any age, but a new study shows that frequent moves in childhood are related to poorer well-being(幸福) in hood, especially among peop...
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