X，Y，Z都是金属，把X浸入Z的硝酸盐溶液中，X的表面有Z析出，X与Y组成原电池时，Y为电池的负极。X，Y，Z 3种金属的活动性顺序为[ ]

A．X>Y>Z

B．X>Z>Y

C．Y>X>Z

D．Y>Z>X

根据所给字母提示填写对话中所缺的单词

Disneyland is called by kids all o__1___ the world the “Happiest Place On Earth”. This year Disneyland turns over 50!

I__2__ 1955, the American man Walt Disney built Disney’s first theme park in California, the US.

When he opened it, he wanted t__3_ make a dreamland w__4__ parents and children could both enjoy the happiness and adventure.

From Sleeping Beauty’s castle to the spinning teacups, there’s a lot to see and d__5__ in this dream town.

There a   6   now 11 Disneyland parks in the world. Since 1955, Disneyland parks h  7  welcomed over 500 million visitors.

The11th Disneyland is in HongKong. It will be the first Disneyland in China and will o 8  in September.

Disneyland parks will give dance shows and open new castles to celebrate the birthday.

Visitors can have their pictures t  9  with their favourite Disney stars, like Mickey M__10 .