单项选择题

When did Moore receive his first commission

A．In 1948.
B．In 1946.
C．In 1931.
D．In 1928.
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How many causes of bad breath does the passage cite
A．One.
B．Two.
C．Three.
D．Four.
单项选择题
Who have found a protein called M2
A．Scientists from a Belgium University.
B．Drug-makers in Belgium.
C．Doctors in a Belgium hospital.
D．it is not mentioned.
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