单项选择题

Why are there two teams to study the same ice

A．They belong to different countries.
B．They compete against each other.
C．They want to confirm their findings.
D．There are too many ices for only one team.

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热门试题

单项选择题

It can be inferred from the measurements that 20,000 years ago, ______.

A．The weather must have been warmer.
B．The weather must have been colder.
C．The weather had remained almost the same.
D．The weather had changed a lot.

单项选择题

According to the news, ice from Greenland gives information about ______.

A．oxygen
B．ancient weather
C．carbon dioxide
D．temperature