龋齿与哪种元素缺乏有关
A.氟
B.硒
C.锌
D.钙
E.碘
参考答案:A
解析:本题考查考生对常见微量元素的熟悉程度。缺少氟易生龋齿,氟多可易生斑釉齿及骨密度增加。
句型转换。
1. So I eat nothing that's been cooked in oil.(改为同义句)
So I _____ eat _____ that's been cooked in oil.
2. You stay away from sugar, _____?(反意疑问句)
3. People who eat a balanced diet should be healthier than those
who only eat biscuits and hamburgers, _____?(反意疑问句)
下面()是国务院直属机构。
A:国家统计局
B:国家海洋局
C:国务院港澳办
D:国务院外事办