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【单选题】
人类关于植物病因的认识下面说法错误的是A.
经历了神道论,病害自生论,环境病因论,微生物病原学说,多因论等五个阶段
B.
吕氏春秋把小麦黑粉病记为“鬼麦”
C.
De Bery经仔细观察研究,发现了导致爱尔兰大饥荒的罪魁祸首是马铃薯晚疫病,并对其致病性及其发育循环侵染进行了描述,为植物病理学做出了划时代的贡献
D.
大多数学者认为植物病害的病原物分三类,分别为真菌,细菌,病毒
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举一反三
【单选题】A decrease in the income tax rate
A.
decreases potential GDP.
B.
increases the supply of labor.
C.
increases the tax wedge.
D.
decreases the demand for labor.
【单选题】If an increase in income results in a decrease in the quantity demanded of a good, then for that good, the _________
A.
income elasticity of demand is negative
B.
cross-price elasticity of demand is negative
C.
price elasticity of demand is elastic
D.
income elasticity of demand is positive
【单选题】If macaroni and cheese is an inferior good, then a decrease in income results in
A.
an increase in the demand for macaroni and cheese.
B.
a decrease in the demand for macaroni and cheese.
C.
an increase in the supply of macaroni and cheese.
D.
a decrease in the supply of macaroni and cheese.
E.
Both answers A and D are correct.
【单选题】Which TWO of the following are credit entries? 1 An increase in a liability 2 A decrease in a liability 3 An increase in income 4 A decrease in income
A.
1 and 3
B.
1 and 4
C.
2 and 3
D.
2 and 4
【单选题】a good (or service) whose consumption declines as income rises and increases as income decreases increase in income=decrease in consumption decrease in income=increase in consumption
A.
price floor
B.
normal good
C.
substitute good
D.
inferior good
【单选题】A 10% decrease in real income usually leads to ________ in money demand.
A.
an increase
B.
no change
C.
a decrease of less than 10%
D.
a decrease of 10%
【单选题】A decrease in income should:
A.
Shift demand for an inferior product inwards
B.
Shift demand for an inferior product outwards
C.
Shift supply for an inferior product outwards
D.
Shift supply for an inferior product inwards
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