单项选择题

It was an allusion to what the scientist thought was an inappropriate distribution of funds for stem cell research.

A．reference
B．contradiction
C．explanation
D．rejection
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单项选择题
Tim is dubious about diet pills which advertise quick weight loss.
A．anxious
B．pessimistic
C．doubtful
D．ignorant
单项选择题
California seems to be the home of the homeless since many are often observed tramping along railroad tracks and through the downtown areas of the cities.
A．roaming
B．trimming
C．stealing
D．stamping
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