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Choose the correct letter, A, B or C. One reason why Jim and Jane felt unsatisfied about the theories discussed in the lecture was that

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酱油的食盐浓度标准是

A. 不得低于5%
B. 不得低于10%
C. 不得高于10%
D. 不得低于15%
E. 不得高于15%

Choose the correct letter, A, B or C. How many patients does the hospital consult every year

以下关于低温环境下的营养需要的叙述中错误的是

A. 增加维生素A摄入
B. 增加维生素B1、维生素B2的摄入
C. 维生素C应额外补充
D. 寒带地区居民钠盐的摄入应低于温带居民
E. 寒带地区极易缺乏钙

Choose the correct letter, A, B or C. What does Jim think about the difference among species in natural and artificial light