单项选择题

Questions 27 to 30 are based on the passage you have just heard.
（）

A．The West Antarctic region was once an open ocean.
B．The West Antarctic ice sheet was about 7,000 feet thick.
C．The West Antarctic ice sheet was once floating ice.
D．The West Antarctic region used to be warmer than today.

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单项选择题

（）

A．She cannot stand her boss’s bad temper.
B．She has often been criticized by her boss.
C．She has made up her mind to resign.
D．She never regrets any decisions she makes.

单项选择题

What do scientists seem to agree upon, judging from the first two paragraphs（）

A．Einstein pushed mathematics almost to its limits.
B．It will take another Einstein to build a unified theory.
C．No physicist is likely to surpass Einstein in the next 200 years.
D．It will be some time before a new Einstein emerges.

Questions 27 to 30 are based on the passage you have just heard. （）

Questions 27 to 30 are based on the passage you have just heard.
（）