单项选择题

John is collaborating with Mary in writing an article.

A．cooperating
B．competing
C．combining
D．arguing
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单项选择题
The 20 patients had stem cell injections instead of surgery.
A．A．Right
B．B．Wrong
C．C．Not mentioned
单项选择题
Glucose cannot be turned into energy in the body
A．without diabetes,
B．without sugar,
C．without insulin.
D．without food.
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