如图，在△ABC中，AB<AC，BC边上的垂直平分线DE交BE于点D，交AC于点E．若AC＝8cm，△ABE的周长为15cm，则AB的长为(    )

某人因醉酒而导致语无伦次，这是因为酒精麻痹了（　　）

A：Parks are really important in a neighborhood. ____

B：Sounds good.What can we do?

A：Well, we can pick up garbage(垃圾)．

B：What a great idea! ____

A：Yes, let's ask them to come.We can ask the neighbors, too.

B：____

A：We should bring garbage bags and buckets(水桶)．

B：____

A：Let's volunteer on Saturday.The weather will be sunny.

B：____ 

A：Wear old clothes.We'll probably get dirty.

B：OK.I will tell the others.

A．People must keep them clean.

B．When should we volunteer?

C．What should we wear?

D．Maybe we can invite our friends to help.

E．Let's volunteer to clean up Central Park.

F．I learned a lot from the activity.

G．What should we bring?

有关西北地区的自然资源的说法错误的是（　　）