Questions 8 to 10 are based on the following news from the VOA. At the end of the news item, you will be given 10 seconds to answer each question. Now listen to the news. The scientists at the Kennedy Space center laboratory have been able to produce small kinds of ______.
A．wheat, soybeans, carrot and lettuce B．soybeans, tomatoes, carrot and wheat C．white potatoes, carrot, lettuce and soybeans D．wheat, soybeans; lettuce and white potatoes