单项选择题

Questions 11 to 13 are based on the following talk on greenhouse gas. You now have 15 seconds to read Questions 11 to 13.
Which of the following is NOT mentioned as a cause of atmospheric methane concentration

A．Natural grassland.
B．Mining.
C．Agricultural rice.
D．Cattle and sheep.

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单项选择题

单项选择题

单项选择题

Questions 11 to 13 are based on the following talk on greenhouse gas. You now have 15 seconds to read Questions 11 to 13.Which of the following is NOT mentioned as a cause of atmospheric methane concentration