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.
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.