患者，女，30岁。已婚3年不孕，月经2～3个月一行，头晕耳鸣，腰疫腿软，畏寒肢冷，性

气压试验所用的气体应为( )。

A．清洁空气

B．氧气

C．压缩空气

D．惰性气体

材料一：据国家统计局发布的数据显示，2009年1~2月，中国社会消费品零售总额达到20080。4亿元，同比增长15。2%，但涨幅比去年同期回落5个百分点。有专家指出，受全球经济危机和我国股市走弱的影响，居民财产性收入增速减缓。收入预期和经济不景气的明显下行趋势将直接导致我国消费者信心的下滑，2009年我国居民消费存在降温可能。

材料二；近年来，我国政府为了增加居民收入，扩大居民消费，保障人民生活，采取了一系列措施。如加强“三农”工作，增加农民收入；稳步推进医药卫生事业改革；实施更加积极的就业政策；加快完善社会保障体系；大力发展教育事业；维护社会稳定，促进社会和谐。

请运用经济学有关道理回答(1)-(2)问：

（1）2009年我国居民消费可能降温的经济学依据是什么？（3分）

（2）“经济不景气时，需要在全社会鼓励消费。”这样做的原因是什么？（12分）

（3）分析材料二所体现的政治生活道理（10分）

盐城是全国酸雨高发地区之一，某化学兴趣小组得知酸雨是因空气中的二氧化硫与水反应生成酸而导致，他们想对此进行探究，请你参与他们的探究过程：

（1）做出假设：_______________；

（2）设计方案：用紫色的石蕊试液浸泡，制成紫色纸花并晾干。先验证水能否使紫色纸花变色，再验证二氧化硫气体能否使干燥的紫色纸花试纸变色，最后验证二氧化硫气体能否使湿润的蓝色石蕊试纸紫色纸花变红，实验装置和药品如图：

（3）查阅资料：你认为该实验小组需要掌握的资料内容中应包括________（填序号）

①二氧化硫易溶于水 ②酸能使湿润的蓝色石蕊试纸变红 ③SO₂不与浓硫酸反应

（4）实验： ①实验中纸花（Ⅱ）的颜色始终没有变化，这说明________。

②纸花（Ⅲ）在实验过程中始终未见变色，此现象说明_________。

③实验Ⅰ的作用是_________。

（5）结论：实验过程中只有Ⅳ纸花变红，说明原假设_______（填“成立”或“不成立”）

阅读理解。

     It is reported that conservation groups in North America have been arguing about the benefits and dangers

of wolves. Some groups believe wolves should be killed. Other people believe wolves must be protected so

that they will not disappear from the wilderness (荒野).

                                                               For Killing Wolves

      In Alaska, the wolf almost disappeared a few years ago, because hunters were killing hundreds of them

for sport. However, laws were established to protect the wolves from sportsmen and people who catch the

animals for their fur. So the wolf population has greatly increased. Now there are so many wolves that they

are destroying their own food supply.

     A wolf naturally eats animals in the deer family. People in the wilderness also hunt deer for food. Many of

the animals have been destroyed by the very cold winters recently and by changes in the wilderness plant life.

When the deer can't find enough food, they die. 

     If the wolves continue to kill large numbers of deer, their prey (猎物) will disappear some day. And the

wolves will, too. So we must change the cycle of life in the wilderness to balance the ecology. If we killed

more wolves, we would save them and their prey from dying out. We'd also save some farm animals.  

     In another northern state, wolves attack cows and chickens for food. Farmers want the government to

send biologists to study the problem. They believe it necessary to kill wolves in some areas and to protect

them in places where there is a small wolf population. 

                                                             Against Killing Wolves

     If you had lived long ago, you would have heard many different stories about the dangerous wolf.

According to most stories, hungry wolves often kill people for food. Even today, the stories of the "big bad

wolf'＂will not disappear.

     But the fact is that wolves are afraid of people and they seldom travel in areas where there is a human

smell. When wolves eat other animals, they usually kill the very young or the sick and injured. The strongest

survive. No kind of animal would have survived through the centuries if the weak members had lived. And

has always been a law of nature.

     Although some people say it is good sense to kill wolves, we say it is nonsense! Researchers have found

wolves and their prey living in balance. The wolves keep the deer population from becoming too large, and

that keeps a balance in the wilderness plant life. 

     The real problem is that the areas where wolves can live are being used by people. Even if wilderness

land is not used directly for human needs, the wolves can't always find enough food. So they travel to the

nearest source, which is often a farm. Then there is danger. The "big bad wolf" has arrived! And everyone

knows what happens next.

1. According to the passage,some people in North America favor killing wolves for all the following reasons

    EXCET that _____. [ ]

A. there are too many wolves

B. they kill large numbers deer

C. they attack cows and chickens for food

D. they destroy the wilderness plant life

2. Some people are against killing wolves because _____. [ ]

A. wolves help to keep the ecological balance in the wideness

B. there is too small a wolf population in the wilderness

C. there are too many deer in the wilderness

D. wolves are afraid of people and never attack people

3. According to those against killing wolves,when wolves eat other animals, _____.[ ]

A. they never eat strong and healthy ones

B. they always go against the law of nature

C. they might help this kind of animals survive in nature

D. they disturb the ecological balance in the wilderness

4. The last sentence "And everyone knows what happens next" implies that in such cases _____. [ ]

A. farm animals will be in danger and have to be shipped away

B. wolves will kill people and people will in turn kill them

C. wolves will find enough food sources on farms

D. people will leave the areas where wolves can live

间接费由（）组成

A.措施费

B.规费

C.企业管理费

D.利润