A．reduce the carbon dioxide

　　B．keep the carbon in the soil

　　C．reduce the loss of nutrients in the soil

　　D．absorb the carbon dioxide

　　59．Which of the following can be the best title of the passage?

　　A．Using Charcoal to Make soil into"Black Gold"

　　B．Using Charcoal to Reduce the Carbon Dioxide

　　C．How Amazon River Basin Produces" Golden Black"

　　D．Guo's Research on Producing Biochar

　　B

　　If you travel to a new exhibit at the San Francisco Conservatory of Flowers, you will have chances to see some meat-eating plants．Take bladderworts．a kind of such plant, for example．They appear so small and grow in a quiet pond．But these are the fastest-known killers of the plant kingdom, able to capture a small insect in 1/50 of a second using a trap door!

　　Once the trap door closes on the victim, the enzymes （酶） similar to those in the human stomach slowly digest

　　the insect．When dinner is over, the plant opens the trap door and is ready to trap again．

　　Meat-eating plants grow mostly in wet areas with soil that doesn't offer much food value．In such conditions, these amazing plants have developed insect traps to get their nutritional needs over thousands of years．North America has more such plants than any other continent．

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