单项选择题

Iron and steel expands when heated and_______when cooled.

A．shrinks
B．contracts
C．condenses
D．compresses
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What do we infer about the man at the registration
A．He is not eligible for the discount.
B．He will not attend the conference from beginning to end.
C．He is working on a postgraduate program.
D．He is on the faculty of the Education Department.
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Who first had the idea of forming the Red Cross
A．Mogen David.
B．Jean Dunant.
C．Clara Barton.
D．A person who needed help.
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