单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．The Arctic land.
B．Iceberg.
C．Active volcano.
D．Ice age.
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单项选择题
A．Because it keeps you calm.B．Because it strengthen your memory.C．Because it stimulates your nerve activity.D．Because it improves your problem-solving strategies.
A．Because it keeps you calm.
B．Because it strengthen your memory.
C．Because it stimulates your nerve activity.
D．Because it improves your problem-solving strategies.
单项选择题
A．8 years.B．16 years.C．20 years.D．30 years.
A．8 years.
B．16 years.
C．20 years.
D．30 years.
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