人体缺乏必需的元素易患疾病，下列说法正确的是
| A． | 缺铁易引起贫血 | B． | 缺氟会引起甲状腺肿大 |
| C． | 青少年预防佝偻病，应适量补锌 | D． | 碘元素摄入量不足易患骨质疏松症 |
相关试题
more, and you'll improve your spoken English.
| A． | Speak | B． | Speaks | C． | Speaking | D． | To speak |
--- I've just got a postcard from my pen friend.
--- Let me have a look
. Wow.nice card!
| A． | What | B． | What a | C． | How | D． | Why |
--- What is your favourite sport?
--- Swimming, I think. It's of all.
| A． | earsier | B． | more difficult | C． | the most interesting | D． | the most boring |
---I use your ruler, Lingling?
--- Sure. Here you are.
| A． | May | B． | Would | C． | Need | D． | Must |
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