The results demonstrated that biochar can increase organic matter in soil．Loss of nutrients in soil is an increasing problem worldwide as farmers try to grow more food for growing populations．

　　Next, the team will carry out a five-year study of biochar with spinach （菠菜）, green peppers and tomatoes．

　　Mingxin Guo says he learns about the ''black gold" in Brazil from a magazine story．He explains that it was discovered in the jungle, in the area where waters flow to the Amazon, in the 1960's．But it was not until recent years that scientists began to bring public attention to it.

　　56．According to the passage, which of the following statements is TRUE?

　　A．The researchers will go on proving their theory．

　　B．The leading researcher learns the theory from the magazine．

　　C．Charcoal was discovered 1,500 years ago．

　　D．Common farming can produce more carbon dioxide．

　　57．Biochar has the following advantages EXCEPT that ____ ．

　　A．it can improve the condition of the soil

　　B．it can be used as a kind of energy

　　C．it can help against global warming

　　D．it can increase productivity of the corn

　　58．According to the research, the biochar can help against global warming because it can

　　.

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