单项选择题

Questions 26 to 29 are based on the passage you have just heard.

A．Wars or natural disasters make them lose their families.
B．They want to help their families cam enough money to survive.
C．They are poor.
D．All the above.
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单项选择题
A．They bought the motorbike.B．They had no timerC．They didn’t want a refrigerator.D．There’s nothing wrong with the old one.
A．They bought the motorbike.
B．They had no timer
C．They didn’t want a refrigerator.
D．There’s nothing wrong with the old one.
填空题
The comparative rarity of IOK-1 means that significant changes must have occurred in the universe over the 60 million years that ______.
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