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151. The trouble is that it is extremely difficult to be sure about radiation damage --a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of deformed children or even grandchildren. 152. In the end , only 7 out of 19 regular Cola drinkers correctly identified their brand of choice in all for trails. The diet-Cola drinkers did a little worseonly 7 of 27 identified all four sample correctly. 153. Taste is such a subjective matter that we dont usually conduct preference tests for food. 154. It seems simple enough to distinguish between the organism and the surrounding environment and to separate forces acting on an organism into those that are internal and biological and those that are external and environmental. 155. But in actual practice this system breaks down in many ways, because the organism and the environment are constantly interacting so that the environment is modified by the orgainism and vice versa . 151、问题是很难明确辐射的伤害一个人可能感觉良好，但他(她)的性器官细胞可能受到损伤，而且有些直到生下畸形儿甚至是畸形孙儿才会被发现。 152、最后，只有7/19的传统可乐爱好者正确地辨别出了他们的品牌，而低糖可乐爱好者水平更差只有7/27的人辩出了四种混合的品牌。 | 
