依本项规则加 ed 。⑤原形动词词尾为‘’元音+l,r ‘’,并为重读音节时,常双写词尾后加 ed 。※英语字母‘’c ‘’后面接‘’e,l ‘’时通常都发[s] 音,如 face , city 。因此, 如 ic 作动词使用时,其词形变化为了要保住其词尾的[k] 音,通常都先加 k之后再加 ing 或 ed 。●Culture and Entertainment The Food Guide Pyramid The food guide pyramid ( 金字塔)is an educational tool that mend the kinds and amounts of foods to eat each day. Any food made from wheat,rice, oats( 燕麦),or another ceral grain is a grain product. Grains are important sources of many nutrients,including dietary fiber ,several B viatmins and minerals( 矿物). The amount of grains you need to eat depends on your age ,sex,and level of physical activity.Most Americans consume enough grains ,but few are whole grains ,provides health benefits.People who eat whole grains as part of a healthy diet have a reduced risk of some chronic disease.
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