下列有关人类活动对群落演替影响的表述,正确的是( )
A:人类活动对群落的影响都是破坏性的
B:人类活动可以任意对生物与环境的相互关系加以控制
C:人类活动往往使群落按照不同于自然演替的方向和速度进行演替
D:人类活动对群落的影响要远远超过其他所有自然因素的影响
When I was a little girl, I lived with my grandparents in a small village(村庄).The life there was 1, and I liked it very much. I had many friends and I liked playing with them 2 . After rainy days, there was much 3 in the river(河) near our house. I often went there to get4with my friends. I had 5fun living there.Now I live in a big city. I study in a school, but I6my life here. It’s too busy and it often makes me very7. Now the most interesting thing for me is to go to my grandparents’ home to8my vacation. Every time I can’t 9to go there. I 10 a quiet life. I hope to live in a village when I’m older.
“法律足以说明罗马的精神。在历史上,罗马代表秩序,就如同希腊代表自由。希腊留下的民主与哲学,罗马留下的法律与政绩,则成为社会秩序的基础。”材料说明罗马法( )
The weather in Hainan is ours.
进入20世纪后,几乎每年至少有一种鸟类或哺乳动物从地球上消失,造成野生动物濒危或绝灭的主要原因是( )