阅读短文，选择正确的答案。

   Tom and his father are playing in the playground. There is a cat and a dog there. They are playing with a ball together. “I think the cat is older than the dog," Tom says, “I don't think so," his father says. “Why?" “Because the dog looks bigger than the cat " Tom laughs and says, "But I like the cat. It is white and it is funnier than the dog. "Tom's father says, “Dogs are my favourite animals because they are very friendly to me" "Yes, but I like smaller ones. Can we keep one?" Tom says. "Of course," Tom's father says.

When I got to the bus stop. I missed the early bus and I had to____ the next one.

角的两条边成一条射线时，组成的角是直角．

如下图所示，设水对瓶子底部的压强为p，瓶子对桌面的压强为p′。将瓶子从正放（如图甲）变为倒放（如图乙），则p和p′的变化情况是（   )

读北美洲地形对气候的影响以及北美洲气候类型分布图，回答下列各题：

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