[单项选择]
The study of ecology is important for everyone who cares about our world. Air, water, and land -- we would not live without any of these. But what do we mean by land It is the earth beneath our feet, wherever we are. It is mountains and plains. It is wide fields for growing com and wheat. Or it may be an airfield or a parking lot or a highway or a whole city -- land covered with cement, asphalt, and buildings. Land is the solid part of the Earth.
Land is the soil plants grow in. That is the most important things about the land -- it is the place where green plants grow. Without green plants there would be not life on Earth. Green leaves make oxygen. All of us -- ants, elephants, people, every living creature -- must have oxygen to stay alive. We breathe in oxygen and our bodies use it. Carbon dioxide is formed in the process and we breathe it out. Leaves use carbon dioxide along with water to make food for plants. Then they give off oxygen.
This process has been g
A. The Products of Nature
B. The Life Pattern on Earth
C. The Exhausted Ecological System
D. The Broken Balance of Nature

更多"The study of ecology is important f"的相关试题:

[单项选择]

The study of ecology is important for everyone who cares about our world. Air, water, and land -- we would not live without any of these. But what do we mean by land It is the earth beneath our feet, wherever we are. It is mountains and plains. It is wide fields for growing com and wheat. Or it may be an airfield or a parking lot or a highway or a whole city -- land covered with cement, asphalt, and buildings. Land is the solid part of the Earth.
Land is the soil plants grow in. That is the most important things about the land -- it is the place where green plants grow. Without green plants there would be not life on Earth. Green leaves make oxygen. All of us -- ants, elephants, people, every living creature -- must have oxygen to stay alive. We breathe in oxygen and our bodies use it. Carbon dioxide is formed in the process and we breathe it out. Leaves use carbon dioxide along with water to make food for plants. Then they give off oxygen.
This process has been g
A. The Products of Nature
B. The Life Pattern on Earth
C. The Exhausted Ecological System
D. The Broken Balance of Nature

查看答案

[填空题]Friendship is important. Everyone need friendship. In all 76. ______
our lives we can live without friendship just as we can’t 77. ______
live without air and water. Friendship makes us get on 78. ______
well with one another to go ahead under different kind of 79. ______
difficulties in front of us. However, true friendship is easy to 80. ______
come by. True friendship must be sincerely and be based 81. ______
on understand each other but not on benefits of each 82. ______
other. A good friend can always be a good teachers to us. 83. ______
Through his advice, we are persuading to go the right way. So 84. ______
more friends we have, the better we can improve ourselves. 85. ______

查看答案

[单项选择]The air surrounding us is important to everyone. Without air, we could not exist. Everyone understands that. But air is necessary in many other ways — ways that are not always so obvious or widely known.
If we did not have air, there would be no sound. Sound travels through air. Where there is no air, there is no sound. Without air there would be no fire. There would be no automobiles, since motors need air in order to operate.
Without air, there would be no wind or clouds. The night time would be very cold and the days very hot. We would be forced to seek shelter from the sun, as there would be no atmosphere to protect us from the sun’s deadly rays.
In this huge ocean of air surrounding the earth, there is more energy than in all the coal, oil and gas we have on the earth. Electrical energy is collected in the atmosphere as water is collected and stored in a dam (大坝). The existence of electricity in the air has been known for centuries. Men have gazed in wonder at
A. for hundreds of years
B. for several years
C. recently
D. for thousands of years

查看答案

我来回答:

提交