我国禁止玉米种子进境是为了防止玉米( )传人我国。
A．大豆疫病B．细菌性枯萎病C．地中海实蝇D．牛海绵状脑病
参考答案：B
营养性巨幼细胞贫血骨髓象特点中哪点是错误的（）
A.幼红细胞呈巨幼变
B.巨核细胞分叶过多，细胞质颗粒减少
C.粒细胞大，分叶过多
D.红细胞细胞质成熟程度较胞核差
E.红系增生明显活跃
—Have you ever seen two leaves that are exactly the same?
—Never. Leaves differ ____ each other ____ size and shape.
A．from; in
B．in; in
C．in; from
D．from; from
