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单项选择题

测定还原糖含量时，对提取液中含有的色素、蛋白质、可溶性果胶、淀粉、单宁等影响测定的杂质必须除去。（ ）

A．对
B．错
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判断题
一般来说，眼睛和口腔附近的肌肉群是面部表情最丰富的部分。
单项选择题
In the excerpt below, the word proximity means ___ .

“One can hardly go wrong in regarding the ego as that part of the id which has been modified by its proximity to the external world and the influence that the latter has had on it …” (Paragraph 3)
A、probability
B、the state, quality or sense of being near; closeness
C、refusal
D、similarity

多项选择题
下列的进程状态变化中，可能发生的是（    ）
A、运行→就绪 
B、运行→等待 
C、等待→运行
D、等待→就绪
E、就绪→运行
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