皮皮学，免费搜题
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【单选题】
免疫原性最强的物质是A.
脂多糖
B.
多糖类
C.
蛋白质
D.
DNA
E.
脂肪
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皮皮学刷刷变学霸
举一反三
【简答题】A. The growth of the publishing industry. B. The history of paper. C. The uses of paper in the nineth century. D. The composition of wood fiber.
【简答题】与模拟图像传输相比较,数字图像传输具有哪些优越性?
【单选题】This passage is most possibly chosen from______.
A.
a newspaper about war
B.
a scientific paper about adventures
C.
a textbook on space travel
D.
a magazine for tourists
【单选题】听力原文：M: I'm still waiting for the clerk to come back and make some copies of this paper for me. W: Why bother him? I'll show you how easy it is to operate the machine. What does the woman mean?
A.
The clerk doesn't like to be bothered.
B.
The machine was just repaired.
C.
She can teach the man to work the machine.
D.
The man shouldn't make any more copies.
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