造成温室效应的气体中排放量最大的是（）。

The earth is changing. Tomorrow it will be different. All the living things on the earth are changing. Even people are changing, and tomorrow you will be different.

There are many kinds of change, and many different things than cause change. People need to realize the changes, to learn to see them, and to learn what causes change.

Human beings must solve many problems so that they can continue to live successfully. War is one of these problems. Disease and natural disaster are problems. Having enough food and energy for the growing number of people in the world is a problem. Most problems can be solved, but some are impossible to solve. The way in which people solve problems affects how long and how well they can live.

As people solve their problems, they change things, and changes often cause new problems for people and for other living things on the earth. Sometimes the new problems seem even worse than the old ones. Human beings will probably never stop having problems to solve. Can you use your imagination to describe a world that has no problems at all ?

小题1:The reason why everything is changing is that______.

A．people want them to be changing

B．there’re many different things that cause them to change

C．the living things are changing

D．the world is too small小题2:People need to solve problems because______.

A．there will be more and more new problems if they don’t solve the old ones.

B．the problems are difficult to solve

C．they have to go on living

D．there are so many things that are changing小题3:New problems appear ______.

A．because old problems aren’t solved.

B．because people don’t solve them

C．because some people are foolish

D．when people are solving old ones小题4:Which of the following if wrong according to the passage ?

A．Disaster and war are two of the problems people have to solve.

B．People need to solve all the problems at the same time.

C．The way people solve problems has much to do with their life.

D．People can’t solve all the problem at one time.小题5:The underlined word “disaster” in the passage probably means “______” in Chinese.

A．灾难

B．资源

C．条件

D．环境

在研究光的反射定律实验中（如图），纸板和平面镜M垂直，将光线沿AO射到平面镜M。第一步：转动右半平面，发现只有左、右两个面在同一平面时，才能在右半平面找到反射光线OB，这说明___________ ；第二步：让入射光线AO逐渐向法线靠拢，观察到 ___________ ；第三步，测量∠AON和∠BON，发现______________________。

当建设工程竣工验收时，为了鉴定工程质量，对隐蔽工程进行必需的开挖和修复，费用应从( )中支付。

A．建设单位的基本预备费

B．建设单位的管理费

C．施工单位的现场管理费

D．施工单位其他直接费

（三）20世纪70年代，我国出现点源污染，80年代城市河段和大气污染严重，生态环境呈现边建设边破坏、建设赶不上破坏的状态，进入20世纪90年代以后，环境污染和生态恶化呈现加剧发展的趋势，特别是1994年淮河暴发的特大污染事故和1998年长江、松花江和嫩江洪涝灾害敲响了生态环境全面恶化的警钟。有数据显示，目前农业对我国污染的“贡献率”已达一半。最近30年，农业成为高排放、高污染的农业。一般的化肥被农作物吸收20%多，最好的复合肥也不过30%，其余的70%要么进入大气污染空气，要么流入江河湖泊或进入土壤。由于大量使用化肥和高剧毒农药，不仅造成土壤、水源污染，更使得农产品化学残留严重，农产品安全成为普遍问题。环境问题已经对我国经济社会发展构成严重制约，成为“两会”期间代表们的热点议题，也引起了社会和国际上的关注。政府把加强环境保护作为重要任务，出台了一系列政策措施，提出了污染减排的约束性指标。我们必须进一步加大工作力度，深入看展环保专项行动，坚决打击违法排污行为，为实现污染减排目标提供保障。

造成上述问题的主要原因是（）

A．一些地方和企业科学发展观尚未得到真正落实，重经济发展、轻环境保护，重形象工程、轻群众利益

B．一些地方环境监管职责不落实，措施不到位，掩盖、纵容环境违法、甚至干扰环境执法

C．一些地方环境监管体制不顺，执法能力严重不足

D． 环境法律法规不完善，“守法成本高，违法成本低”的状况没有改变

婴儿体液总量占体重的（）

A.90％

B.35％

C.78％

D.70％

E.55％