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【单选题】
作为前列腺癌肿瘤标记物的是（）A.
乳酸脱氢酶
B.
β2微球蛋白
C.
癌胚抗原
D.
甲胎蛋白
E.
前列腺特异性抗原
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反馈参考答案：
举一反三
【单选题】的主要作用是接收视频控制主机发送来的编码控制信号，并将控制信号解码为控制动作的命令信号，从而控制摄像机及其辅助设备的各种动作。
A.
编码器
B.
解码器
C.
矩阵
D.
控制键盘
【简答题】(judge) ______ from his accent, he is from the north.
【简答题】____his accent, he must be from the south10. ____his accent, he must be from the south. A.Judged by B.Being judged from C.Judging from D.Being judged by
【单选题】"His accent was not easy to place." What does it mean?
A.
It was not easy to find his accent.
B.
Itwas not easy to know where is he from.
C.
It was not easy to place his accent.
D.
It was not easy to know his accent.
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