单项选择题

A．Working with DNA.
B．Wearing a necklace.
C．Taking blood samples.
D．Making identification tags.
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单项选择题
A．They were inexpensive.B．He’’s going to give them away.C．They were free.D．He has to return them soon.
A．They were inexpensive.
B．He’’s going to give them away.
C．They were free.
D．He has to return them soon.
单项选择题
A．He enjoyed teaching English.B．He wanted to earn more to support his family.C．The owner of the school promised him a good position.D．He could earn more as a teacher than as a travel agent.
A．He enjoyed teaching English.
B．He wanted to earn more to support his family.
C．The owner of the school promised him a good position.
D．He could earn more as a teacher than as a travel agent.
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