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。
---_______she ______at six every day?
---No, she doesn′t.
A.Does, get up
B.Does, gets up
C.Is, get up
D.Is, getting up