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【单选题】
车站一般宜设在 上。A.
直线段
B.
斜线段
C.
曲线段
D.
交叉线段
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【简答题】Holidays are often associated with no work and all play. People seek to enjoy their holidays in different ways. Vacation packages (一揽子交易) have been in existence for a long time. ---小题1:--- So now peop...
【简答题】A．To establish priorities among all tasks first. B．To allocate mental resources to different tasks. C．To supervise the preparatory work of the tasks. D．To think twice before carrying out multitasking.
【单选题】听力原文：Stem cells are undeveloped human cells that can grow into many or all of the different specialized cells in the human body. Although stem cells have been harvested from adults, the most versatile...
A.
It discusses fertility clinics.
B.
It defines stem cells.
C.
It mentions artificial fertilization.
D.
It identifies the origins of stem cells.
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