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问题
单项选择题
婴幼儿营养性疾病是婴幼儿营养素摄入（）导致的疾病。
A.过量或比例不当
B.过量、不足或比例不当
C.不足或比例不当
D.比例不当
答案
参考答案：B
选择题
Can you think ______?
A. what is his job
B. what does his job
C. what his job does
D. what his job is
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填空题
元素迁移的水动力条件，主要与（）与（）有关。
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