B. are too common to be noted C. can be noticed within hours
D. can be ignored 52. We know from the passage that the symptoms of food poisoning ____. 52. C
细节理解题。由第一段倒数第二句The symptoms of food poisoning usually begin within hours of eating the poisoned food (食物中毒的症状通常在吃了有毒食物后几个小时内显现出来)可知, 选C。 A. some chemicals
B. low temperatures C. some tiny living things
D. certain natural materials 53. Food poisoning can be caused by all the following EXCEPT ____. 53. B
细节理解题。由第三段第一句Some chemicals can also cause food poisoning可知,选项A符合事实;由第二段these tiny living things release poisons that make people sick可知选项C符合事实;由第四段第一句Some plants and animals contain natural poisons that are harmful to people可知,选项D符合事实。只有选项B与文中内容不符。 A. mushrooms should not be eaten B. vegetables are safer than meat and seafood C. natural poisons are more dangerous than chemicals D. different types of food should be handled differently 54. From Paragraph 5, we can learn that ____. 54. D
推理判断题。本段讲到微生物繁殖快、食物表面的化学物质、某些食品(如蘑菇)本身含有的天然毒素、某些鱼可能有毒等四种类型的食物中毒的不同处理方式。因此,可以得出结论“不同类型的食物应当用不同方法来处理”,故选D。 A. natural materials are safe in food processing
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