在下面的自我介绍中，填入合适的词。

     Hello. My name is Jim. I'm from England. My favourite subject (学科) is 1______. My favourite sport is

2______, and I often play football with my friends. My favourite colour is 3______. I have a 4______ family.

They are: my father, my mother and I. My parents 5______ me.

“凤姐只带着丰儿来到园门前，门尚未关只虚虚的掩着。于是主仆二人方推门进去，只见园中月色比外面更觉明朗，满地下重重树影，杳无人声，甚是凄凉寂静。刚欲往秋爽斋这条路来，只听唿的一声风过，吹的那树枝上落叶满园中唰喇喇的作响，树梢上吱喽喽发哨，将那些寒鸦宿鸟都惊飞起来。”这段文字是环境描写，请回答：①环境描写有什么特点？ ②结合本章回情节，谈谈环境描写的作用。