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最常受到烷化的是鸟嘌呤的（）。
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革兰阴性菌人血引起中毒症状，称为（）。
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Spoilt for Choice
Some research which was recently carried out in Britain has confirmed what many ordinary shoppers have suspected for quite a long time. Having a _____（51）selection of goods to choose from is not necessarily a _____（52）to consumers. The average supermarket in Britain has around 40，000 different products on sale at any one time and if you"re _____（53）of buying a car， then there are actually around 1，600 different _____（54）on the market.
In one sense， choice is a good thing because it _____（55）use to buy those products which best suit our needs. But choice can also _____（56）something of a problem. With over 400brands of shampoo on the market， how does the consumer _____（57）hold of the information necessary to choose between them？For some people the solution is to buy only well-known brands， whilst others are happy to be _____（58）by advertising. There is evidence， _____（59）， that for some people the _____（60）of choice available to them in Britain"s consumer society is actually a _____（61）of anxiety and stress. One man interviewed by the researchers admitted that he had _____（62）out to buy his girlfriend a mobile phone for her birthday， but was so _____（63）by the number of different types on offer in the shop that he _____（64）up and decided to buy her a bundle（束）of flowers _____（65）!
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副溶血性弧菌引起的食物中毒的主要特点是()
我国10大类法定职业病是哪些？
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