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【多选题】
以下可以自由铸造银币的货币制度是（）A.
银币本位制
B.
跛行本位制
C.
金汇兑本位制
D.
平行本位制
E.
双本位制
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反馈参考答案：
举一反三
【单选题】With more and more farmers moving to cities, an inadequate labor force is becoming a major factor affecting the country's grain output.
A.
automatically
B.
occasionally
C.
absolutely
D.
gradually
【单选题】It can be inferred from the passage that which of the following has been a factor influencing the extent to which research on mycorrhizal fungi has progressed?
A.
lack of funding for such research
B.
lack of immediate application of such research
C.
difficulties surrounding laboratory production of specimens for study.
D.
lack of a method for identifying mycorrhizal fungi
【单选题】I can't say which type of tea tastes better. It's just a (an) _____ of personal preference. [ ]
A.
affair
B.
problem
C.
variety
D.
matter
【单选题】Which of the following can be external negative factor?
A.
Toxic mental state
B.
Lack of vigilance
C.
Negative friends
D.
Adoption of friend's thought
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