群落水平的分类主要依靠（）。
A.地面调查
B.作为群落生境要素的地貌、土壤以及水热条件等
C.低空高分辨率的航空相片
D.航空或卫星遥感资料
参考答案：D
根据图画填空，每空一词。
1. — Did you _____ to the cinema yesterday?
—Yes, I _____ a great film.
2. —_____ did they do after school?
—They _____ football.
3. —_____ kind of drink would you like?
—I'd like _____ drink.
4. —What movie do you _____ like seeing?
—_____. It is my favourite.
5. —_____ you buy a book for your father?
—No, I didn't. I _____ a bike for him.
以下影响蒸发过程的因素有（）
A.药液蒸发的面积
B.液体表面压力
C.搅拌
D.加热温度与液体温度的温度差
E.液体粘度
