精子()
A.形似蝌蚪
B.呈圆形
C.覆盖精子头的前部
D.由核和顶体组成
E.是精子的运动器官
参考答案:A
Jim is ______ honest boy in my class. He bought me _____ useful book as a birthday present.[ ]
A. a, an
B. an, a
C. a, a
D. an, an
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