Plant Gas
2. Previously, researchers had thought that it was impossible for plants to make significant amounts of the gas. They had assumed that microbes need to be in environments without oxygen to produce methane. Methane is a greenhouse gas, like carbon dioxide. Gases such as methane and carbon dioxide trap heat in Earths atmosphere and contribute to global warming.
4. With the dried plants, the researchers took measurement at temperatures ranging from 30 degrees Celsius to 70 degrees C. At 30 degrees C, they found, a gram of dried plant material released up to 3 nanograms of methane per hour. With every 10-degree rise in temperature, the amount of methane released each hour roughly doubled.
6. Because there was plenty of oxygen available, its unlikely that the types of bacteria that normally make methane were involved. Experiments on plants that were grown in water rather than soil also resulted in methane emissions. Thats another strong sign that the gas came from the plants and not soil microbes.
注释:
2. microbe:细菌,意义同 bacterium,但 microbe 不用作专门术语。
练习:
A) It was produced from plants.
C) It was produced in oxygen-free environments.
2. To test whether plants are a source of methane, the scientists created ______.
B) an environment with the same concentration of oxygen as the Earth has.
D) an environment filled with the greenhouse gas
A) The lower the temperature, the higher the amount of methane emissions.
C) When exposed to sunlight, plants stop releasing methane.
4. What of the following about methane is Not mentioned in the passage?
B) Plants growing in water release methane.
D) Microbes in plants produce methane.
A) Methane becomes less poisonous.
C) Less methane reaches the atmosphere.
Happiness and Wealth
日韩大选的区别
美国国务卿克林顿前往中东争取化解以巴冲突
爱不论晴雨
爱的召唤
Today is a gift
This Beautiful Moment
The Key to Happiness
以色列军人开枪打死一名巴勒斯坦人
浑水做空奥兰有戏吗?
美丽的情话
东南亚高增长吸引投资者目光
我的母亲教我
The Gift of Possibility
保持幸福的几条箴言
日本年轻人的创业潮
A father's love
埃及反对派联合反对总统穆尔西扩权
Mother's Hands
在最美的时候 你遇见了谁
孟加拉制衣厂大火引发街头抗议
冬日漫步
The Love in That Summer
纯洁的爱
Seven secrets to a great life
浑水质疑奥兰国际灰色会计做法
励志短文一篇
石头的理想
情暖今生
透过婴儿的眼睛
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |