夏季的一天，青蛙说：“今天我吃了3210只蚊子．”蜘蛛说：“你吹牛，我替你数的是344只蚊子．”原来青蛙有4条腿，按四进制计数，而蜘蛛有八条腿，按八进制计数．那么按十进制计数，青蛙吃了多少只蚊子？

如图所示为一个紫砂壶，它工艺考究，做工精细．在壶盖上开有一个小孔，其作用是在倒水时内外的____ 相等．由于壶身和壶嘴构成____ ，为方便装水和倒水因而要求它们的高度相平．

阅读短文，判断正误。对的写正确，错的写错误。

Ken: Today is Sue's birthday. Let's buy a gift for her.

Ann: OK. Let's go.

Ken：What about these sweatpants?

Ann: Oh, no. They aren't her style. She likes cool clothes.

Ken: Oh, yes. She likes music. This is the latest CD. Does she like this one?

Ann: She likes pop music, but she prefers Jazz music. This one is OK.

Ken: How much is it?

Assistant: $13.

Ken: We'll take it. Thank you.

Assistant: That's all right. Bye!

填上适当的词语。

一____人       一____马

一____鸟       一____河

一____山       一____树