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问题 单项选择题

有以下程序
main () unsigned char a, b, c;
a=0x3; b=a｜0x8; c=b＜＜1;
printf ("~%d% d\n" ,b, C) ; 程序运行后的输出结果是

A．-11 12

B．-6-13

C．12 24

D．11 22

答案

参考答案：D

解析： 本题考查的知识点是位的逻辑运算和位的移位运算。将a的值转换为二进制位：0000 0011，再与0×8的；进制“0000 1000”位与，得到结果“0000 1011”赋值给b，b的值为 11，再将b左移一位得到：0001 0110，赋值给c，c的值为22，所以最后输出的b，c的值位11，22。所以4个选项中D正确。

实验题

削过皮的苹果过一段时间后颜色就会由白色变为褐色，食品科学上称为“褐变”。某研究性学习小组查阅有关资料，发现不同文献解释不同。

I、《化学教学》：苹果中Fe2+被空气中的O2氧化成Fe3+而变色。

II、《中学化学教学参考》：苹果中的酚类物质在苹果中的氧化酶催化下被空气中的O2氧化而生成有色物质。已知酚类物质遇FeCl3溶液常发生颜色反应而呈现一定颜色。如苯酚显紫色，对苯二酚显绿色，甲基苯酚显蓝色。

(1)为探究苹果“褐变”是否为I的原因，小组设计了如下实验：

①刚削皮的苹果立刻滴上2～3滴A溶液，继而再滴上几滴氯水。

②在“褐变”后的苹果滴上2～3滴A溶液。

回答下列问题：A溶液是_________溶液(填化学式)。若I的解释正确，写出①中有关的离子方程式____________________；实验①②的实验现象应为：①________________________ ②_____________________。经实验，①②均无明显现象。说明观点I的解释是错误的。

(2)为探究苹果“褐变”是否为II的原因，小组又设计了如下实验。在表中填写实验①②探究目的和结论。

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What are the challenges facing multinationals that want to build their brands in China —I think the first thing is ignorance. There’s a huge (1) of the complexity in China, which is more complex than Europe. There are different rules of law, which (2) a significant factor. There are different (3) , Cantonese and Mandarin and lots of others in (4) , and dialects like Sichuan versions. You have problems of distribution. (5) Chinese brands have been (6) local because of the size of the market and the transportation system, What’s (7) built up there is a sort of a pride in localness.
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How are local Chinese brands doing against the multinationals —China’s been built (16) local brands and there are a billion of them and they are (17) spending sums of money locally that really dominate the (18) . But the future is Chinese brands moving outside of (19) and marketing globally, because China’s got to move from a commodity economy to a (20) sophisticated economy, which fundamentally (21) brands. There isn’t a major economy in the world that (22) based upon producing great brands, because they provide far better margins and more sustainable (23) .
Has Asia produced any truly global brands —Japan has. Some of the major companies (24) do really very well with brands. In Korea, some of them (25) but some of them need to catch up in terms of understanding how to really build global brands.
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