5月12日，我国汶川发生大地震．全国人民“众志成城，抗震救灾”．“拯救生命是第一位的”．为搜救埋在废墟下的幸存者，调用了许多搜救犬．搜救犬能根据人体发出的气味发现幸存者．从微观的角度分析搜救犬能发现幸存者的原因是______．
A．分子的质量很小 B．不同分子性质不同 C．分子不断运动 D．分子间有间隔．
搜救犬根据人体发出的气味发现幸存者，说明人体气味的分子在不断的运动，向四周扩散，被搜救犬嗅到．
A、搜救犬能发现幸存者的原因是分子是在不断的运动，与分子质量小无关，故选项错误．
B、搜救犬能发现幸存者的原因是分子是在不断的运动，不能说明不同分子性质不同，故选项错误．
C、搜救犬能发现幸存者的原因是分子是在不断运动的，故选项正确．
D、搜救犬嗅到气味和分子间有间隔无关，故选项错误．
故选C．
Women are meant to be the experts at shopping, but new research reveals the whole experience leaves them stressed. The surprise findings show that not all women get comfort from shopping. In fact, in a supermarket environment, one third of females feel it a burden when they do the weekly shop despite being organized and armed with shopping lists, The reason why women are more nervous in the supermarket is largely that they are rushing round trying to conduct the shopping as quickly as possible. Doing the food shop will be one item on a massive list of jobs，and something which simply has to be done at speed. Women even admitted to having an argument with another shopper in the supermarket－either because of trolley rage, fighting over the same item or queue jumping. They can't stand feeling rushed when the cashier scans items too quickly so they struggle to get everything into the right bags. In contrast, three quarters of men quite enjoy their food shopping experience and are happy to push their way around the aisles searching out products. Men are less forgetful about what they want to buy, are less likely to feel rushed by the cashiers and are more methodical at the checkouts. Men seem to adopt a much more laid back and methodical approach, taking their time looking for bargains and make sure they're getting the most for their money. But the poll suggests women are the savvier shoppers—as they are less baffled by all the different brands in the shop and are more likely to ask for help if needed.
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