题目内容：
Passage Two：It is becoming more and more difficult to be sure that the food we eat is not actually harming us. We seem to get one food scare after another.
Several of these, recently, have concerned genetically modified （GM，转基因） foods. Although some experts tell us that these foods will do us no harm and that the concern about them is just speculative, other experts say that GM food is potentially very damaging to health.At the very best, the jury is still out on the matter.
In many countries, products which have been genetically modified are supposed to show this information on their labels, but now some of the large food producers are saying that it is growing increasingly difficult to separate GM food from the conventional varieties.
Pesticides （杀虫剂） and chemical fertilizers are also a cause of concern. In the last few years, a great many people have started to buy organic produce, although this is much more expensive than that which is grown using conventional methods. They do so in an effort to stop filling their bodies, and those of their children, with poisonous chemicals.
Thus there is an increased demand for organic food and this is not a temporary fashion. But some experts claim that organically grown food is no healthier than other food, because the poison level of the latter is not so high as to be harmful. Those who push for organic food may not be objective, but are part of the powerful food lobby, the chief concern of which is to increase organic food production with a corresponding increase in profits.
The use of additives （添加剂） is still another source of anxiety to consumers. These are often added to food to supposedly improve the colour or the flavour. However, it is thought that some of these may be the cause of allergies （过敏）, or even the cause of behavioural problems in children.
We have to eat to live. The problem is: what is safe to eat?
What is people’s main concern about GM foods? A．Some of them are not labeled with required information.
B．They might pose hazards we don’t know yet.
C．They don’t have the same flavour as conventional foods.
D．The sowing of them will damage the environment.
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