单项选择题

A．Fierce competition.
B．Network problems.
C．High price.
D．Government policy.
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单项选择题
A．Working with DNA.B．Wearing a necklace.C．Taking blood samples.D．Making identification tags.
A．Working with DNA.
B．Wearing a necklace.
C．Taking blood samples.
D．Making identification tags.
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.
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