单项选择题

Questions 11 to 13 are based on the following announcement. At the end of the announcement, you will be given 15 seconds to answer the questions.
Now, listen to the announcement. What should you do before you sign up for an account

A．Read the Terms of Service.
B．Check your website ranking.
C．Determine if Adsense is cost-effective to you.
D．Look for advertisers.
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单项选择题
Why is it important to freeze fresh food quickly
A．The cells of plants and animals are damaged by slow freezing.
B．It saves time in the food production process,
C．It reduces the amount of energy required to freeze the food.
D．The food defrosts more quickly.
单项选择题
At what time will the campus tour end
A．12:45 p.m.
B．1:30 p.m.
C．2:00 p.m.
D．2:I5 p.m.
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