单项选择题

Questions 23 to 25 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
Now, listen to the news.
According to the news, ice from Greenland gives information about

A．oxygen.
B．ancient weather.
C．carbon dioxide.
D．temperature.
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单项选择题
What happens if Adams stops at Perth
A．He can’t meet his friends.
B．The flight goes without him.
C．He has to pay more than 795 pounds.
D．He can’t stop at Hong Kong then.
单项选择题
In 1847 most countries of the world were
A．not yet using postage stamps.
B．collecting valuable stamps.
C．buying stamps from Mauritius.
D．printing their own stamps.
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