【单选题】按照配送的流程,在拣货之前的工作是( )
【单选题】The author develops her argument by ______.
B.
comparison and contrast
D.
refuting an opposing view
【判断题】无论在膀胱空虚还是充盈的情况下,膀胱三角处黏膜均平滑而无皱襞。
【单选题】The theory of the origin of the universe is just ______ and lacks proof.
【单选题】产生流砂的内因是土质颗粒大小和粘聚力,外因是( )