皮皮学，免费搜题
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搜题
【单选题】
引起IS曲线向左移动的原因是A.
政府决定修建一条高速公路
B.
政府决定降低个人所得税
C.
中央银行决定降低贴现率
D.
本国汇率升值
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皮皮学刷刷变学霸
举一反三
【单选题】It is implied in the passage that ______.
A.
many scientists had known dinoflagellate before 1988
B.
there had been no such organisms before 1988
C.
many scientists were in doubt about the nature of the organism in 1988
D.
no scientists knew anything about the organism in 1988