单项选择题

Questions 11 to 13 are based on the following radio program "Science around Us". You now have 15 seconds to read Questions 11 to 13. Which of the following can be used as fertilizer

A．Waste fuel from the power plant.
B．Raw materials used to produce electricity.
C．Waste water from the power plant.
D．Carbon dioxide produced from burning fuel.
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What is special about open-access journals
A．A higher frequency of citation.
B．A collection of valuable data.
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单项选择题
What was Mr. Wells doing when he learned about fair trade
A．Studying ecology.
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D．Selling tradecraft products.
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