单项选择题

Questions 18 to 20 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. What is the main topic of the news story

A．The coffee market in Boston.
B．The role of supermarkets in the coffee business.
C．A new trend in the United States.
D．The advertising of a new product.
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单项选择题
What is the main purpose of the tour
A．To inform visitors of the park’s history.
B．To provide an overview of the park’s main attractions.
C．To show visitors remote places in the park.
D．To teach visitors how best to photograph wildlife.
单项选择题
What does the new system enable farmers to do
A．Produce larger vegetables.
B．Transport produce more quickly.
C．Grow crops in nontraditional climates.
D．Keep vegetables fresher for a longer period.
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