9×□＜50，□里最大能填6．______．

要除掉粗盐中含有的氯化镁、硫酸镁等杂质，现设计一个除杂质的方案：把粗盐溶于水，过滤得澄清溶液，再进行下列各步骤处理：

①加入氯化钡溶液至沉淀完全；②用盐酸调节pH值，至溶液呈微酸性；③加入氢氧化钠溶液，至沉淀完全；④过滤，废弃滤出的沉淀，取滤液；⑤加入碳酸钠溶液，至沉淀完全．最后蒸发浓缩，使氯化钠晶体析出．对上述各处理步骤的顺序安排合理的是[ ]

A．①②③④⑤

B．②①③④⑤

C．③①⑤④

D．②③⑤④①

读图，回答问题.

小题1:若图表示人口年龄结构图（注：区域65岁以上老年人占总人口比例超过7﹪则进入老龄化社会），其中a表示0—14岁，b表示15—64岁，c表示65岁以上，则下列关于①国家说法正确的是：

A．国家社会负担较轻

B．国家可能是印度

C．国家已进入老龄化社会

D．国家经济发展水平很低小题2:若图表示工业部门对区位因素(仅考虑劳动力、能源、原料)的依赖程度，其中a表示劳动力，b表示能源，c表示原料。则图中①②③分别代表的工业部门最可能是：

A．炼铝、服装、家具制造

B．炼铝、啤酒厂、制鞋

C．汽车、造船、水泥

D．炼铜、制糖、服装小题3:若图表示不同区域产业结构情况，其中a表示第一产业，b表示第二产业，c表示第三产业，下列说法正确的是：

A．①区域处于以传统农业为主体的发展阶段

B．②国家可能是朝鲜

C．④区域处于高效益综合发展阶段

D．③国家可能是美国

Read the passage and fill in the blanks with the proper words(在短文的空格内填入适当的词，使其内容通顺，每空格限填一词，首字母已给)

A thousand years ago, Hong Kong was covered by a thick forest. As more and more people came to live in Hong Kong, these trees were cut down and burnt. Now there is no forest left, though there are still some small areas covered with trees. We call these “woods”.

Elephants, tigers and many o__1__ animals were living in the thick forest. When people came to live in Hong Kong, the animals began to die out. Early farmers grew rice and r__2__ pigs and chickens in the valleys. They cut down the trees and burnt them. They needed fire to keep t__3__ warm in winter, to cook their food and to drive away the dangerous animals. Elephants quickly d___4__because there was not enough food for them. So did most of the wolves and tigers.

You might think that there are no longer any animals in Hong Kong e__5__ in the zoos, but there are still about 36 different animals living there. One of the most lovely of Hong Kong’s animals is the barking deer. There are beautiful little animals w__6__ a rich brown coat and a white patch under the tail. They look like deer but they are much smaller. They are less than two feet high. They make a noise rather like a dog barking. In Hong Kong the barking deer has only one r__7__enemy- men. People hunt these little animals though it is illegal(犯法的). There are now not many barking deer left. So it is important for people to protect these wild animals.

伦理学中的义务与政治法律中的义务之不同点是（）

A.个人对他人，对社会应负的道德责任

B.以一定程度上牺牲个人利益为前提的

C.由人们在社会关系中所处地位决定的

D.和一定权利与利益相对应的

下列有关台风的表述，不正确的是______。

A．台风是发生在西太平洋和南海海域，中心附近最大风力达12—13级的热带气旋
B．台风的发生有季节性，一般发生在夏秋之间，最早发生在五月初，最迟发生在十一月
C．台风的形成需要具备广阔的高温、高湿的大气
D．台风眼区是最容易形成灾害的狂风暴雨区