如图是四个地点1月(▲)和7月(●)气温及降水情况示意图，据之完成下列要求：  

(1)a属于        气候，其形成原因是                。

(2)b属于        气候，世界上分布面积最大的地区是                 。

(3)c属于      气候，这种气候特点的形成原因是                     。

(4)d属于          气候，世界上流经这种气候类型区域的大河是          。   

补全对话。

A: What can I do for you, Madam?

B: 1. ________

A: OK. Wc have apples, grapes and bananas on sale.

B: 2. ________

A: F'ive yuan a kilo.

B: I'll take nine apples.  3. ________

A: Three kilos. 4. ________

B: I'd like to buy some grapes for my grandparents. How much are the grapes?

A: Well, the green ones are three yuan a kilo and the red ones are four yuan a kilo.  

B: Two kilos of the red ones, please.

A: All right.

B: 5. ________

A: Thank you.