（Ⅰ）求△ABM与△ABC的面积之比

（Ⅱ）若N为AB中点， $\overrightarrow{AM}$ 与 $\overrightarrow{CN}$ 交于点P且 $\overrightarrow{AP}$ =x $\overrightarrow{AB}$ +y $\overrightarrow{AC}$ （x，y∈R），求x+y的值．

阅读《“红领巾”真好》，按课文内容填空。

   My name is Chen Lan. My home is in Gulangyu. Do you know it? It is in Xiamen. It is near the sea(海). Gulangyu is a small place，but it is very nice and clean. There are no cars，no buses. People only walk. So it is very quiet.
   Our house is in the middle of Gulangyu. Behind our house there is a big old tree. My grandfather tells me that the tree is very，very old. There are many birds in the tree. We call it a “bird tree”. Our house is near the sea. The sea is big and blue. There are a lot of fish in the sea. After school，I go there and catch(捉) fish with my friends. It is very interesting. I like fish and I like catching fish.

巴斯德的鹅颈烧瓶实验支持的生命起源观点是（　　）