单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.
The best title for this selection is

A．Food from Coal and Gas
B．Non-spoiling and New Foods
C．Spacecraft Food
D．The Shortage of Food

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单项选择题

单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. The best title for this selection is 您的浏览器不支持 audio 元素。