练习:
1.that was scientists understanding of methane?
A)It was produced from plants.
B)It was not a greenhouse gas.
C)It was produced in oxygen-free environments.
D)It traps more heat than any other greenhouse gas.
2.To test whether plants are a source of methanethe scientists created
A)a oxygen-free environment.
B)an environment with the same concentration of oxygen as the Earth has.
C)a carbon dioxide-free environment.
D)an environment filled with the greenhouse gas
3.hich statement is true of the methane emissions of plants in the experiment?
A)The lower the temperaturethe higher the amount of methane emissions.
B)Living plants release less methane than dried plants at the same temperature.
C)When exposed to sunlightplants stop releasing methane.
D)The higher the temperaturethe greater the amount of methane emissions.
4.What of the following about methane is Not mentioned in the passage ?
A)Plants growing in soil release methane.
B)Plants growing in water release methane.
C)Soil microbes consume methane.
D)Microbes in plants produce methane.
5.What is the beneficial point of some microbes consuming plant-produced methane?
A)Methane becomes less poisonous.
B)methane is turned into a fertilizer.
C)Less methane reaches the atmosphere.
D)Air becomes cleaner
一年级英语下册Unit2 Small animals第三课时教案
一年级英语上册教案 Unit1My classroom 第三课时
沪教版小学英语一年级下册教案unit1课时4
沪教版小学英语一年级下册教案unit1课时3
上海牛津版一年级英语Unit 9 Revision单元分析教案
上海版牛津一年级英语教案Unit8 Playtime(总五课时)
上海牛津版一年级英语Unit7 My family教案
牛津版一年级英语上册unit5 Fruit教案(1)
苏教版小学一年级英语下册Unit5 On the road教案
沪教牛津版一年级英语上册教案Unit1 My classroom第二课时