西部地区分布着众多的少数民族，下面邮票所示的少数民族集中分布在_________

阅读短文，根据短文内容，从从A、B、C、D四个选项中，选出最佳答案．

Australia is the largest island in the world. It is a little smaller than China. It is in the south of the earth. Australia is big, but its population is small. The population of Australia is nearly as large as that of Shanghai.

Enough laws (法律) have been made to fight against pollution. The cities in Australia have got little air or water pollution. The sky is blue and the water is clean. You can clearly see fish swimming in the rivers. Plants grow very well.

Last month we visited Perth,  the biggest city in Western Australia, and went to a wild flowers' exhibi­tion (展览). There we saw a large number of wild flow­ers we had never seen before. We had a wonderful time. Perth is famous for its beautiful wild flowers. In spring every year Perth has the wild flowers' exhibi­tion. After visiting Perth, we spent a day in the coun­tryside. We sat down and had a rest near a path at the foot of a hill. It was quiet and we enjoyed ourselves. Suddenly we heard bells ringing at the top of the hill. What we saw made us pick up all our things and run back to the car as quickly as we could. There were about three hundred sheep coming towards us down the path.

Australia is famous for its sheep and kangaroos. After a short drive from any town,  you will find your­self in the middle of white sheep. Sheep, sheep, every­where are sheep.

小题1:Australia is        .

A．the largest country in the world

B． larger than China

C．as large as Shanghai

D．not so large as China小题2:Enough laws have been made to        .

A．increase the population

B．grow more plants

C．fight against pollution

D．show wild flowers小题3:Perth is        .

A． the capital of Australia

B． in the west of Australia

C． in the east of Australia

D． the biggest city in Australia小题4:In Perth you may visit a wild flowers' exhi­bition in        .

A．October

B．January

C．May

D．July小题5:Which of the following sentences is TRUE?

A．All the big cities in Australia are serious­ly polluted.

B．Australia is famous for its sheep, kanga­roos and large population.

C．We ran back to the car because we were in the middle of the white sheep.

D．If you go to the countryside in Australia, you will see a large number of white sheep.

诊断急性白血病的主要依据是

A．白细胞数目的增多
B．胸骨的压痛
C．有贫血、发热、出血的三大症状
D．骨髓象示：原始+幼稚细胞≥ 30%
E．出现正常细胞性贫血

压力容器内部有压力时，严禁进行任何修理或紧固工作。

在一份水情信息编码中，可编列多个水文要素的信息。要素标识符与其数据应（），标识符在前，数据紧列其后。

A、编列其一

B、分开编列

C、成对编列

D、单独编列

下列属于亚硫酸体系的各还原漂白剂的有效SO₂含量最低的是（）。

A.液态SO₂

B.亚硫酸（6%溶液）

C.亚硫酸钠

D.亚硫酸氢钠