连词成句。
1. you, how, milk, often, do, drink
___________________________________________?
2. the, girl, health, after, her, looks
___________________________________________.
3. every, sleep, night, I, hours, nine
___________________________________________.
4. food, to, me, good, exercise, and, help, better, study
___________________________________________.
5. her, is, the, same, lifestyle, yours, as
___________________________________________?
6. once, week, some, a, exercise, students, twice, or
___________________________________________.
1. How often do you drink milk
2. The girl looks after her health
3. I sleep nine hours every night
4. Good food and exercise help me to study better
5. Is her lifestyle the same as yours
6. Some students exercise once or twice a week
）是人体必需的微量元素，在元素周期表中的位置如下图。下列关于硒元素的叙述正确的是
比
稳定