看图读一读，判断句子正误。
Hi, I'm Sally. On my way to school, I can see some trees, they're green and brown. I can see some clouds(云). They're white. I can see a bike. It's under the tree. It's blueand black. I can see a yellow cat, it's in the tree. I can hear a plane. I canhear a dog. I can hear a car and a bus, too.
：任意 
，有 
，命题 
：存在 
，使得 
．若“ 
或 
为真”，“ 
的取值范围．