单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．250,000.
B．1 million.
C．20 million.
D．50 million.
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单项选择题
A．Because the moon’s composition is different from Earth’s composition.B．Because the moon has almost no iron.C．Because the moon and the Earth are of similar composition.D．Because the Earth’s gravitational force is net strong enough.
A．Because the moon’s composition is different from Earth’s composition.
B．Because the moon has almost no iron.
C．Because the moon and the Earth are of similar composition.
D．Because the Earth’s gravitational force is net strong enough.
单项选择题
A．Patient and nurseB．Teacher and studentC．Secretary and clientD．Guest and receptionist
A．Patient and nurse
B．Teacher and student
C．Secretary and client
D．Guest and receptionist
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