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【多选题】
流行病学研究方法之间的关系是A.
描述性研究是流行病学各种研究方法的基础
B.
现况调查一般不能验证假设，但可以为分析性研究和实验研究提供假设依据
C.
从研究方法本身对于病因的论证强度来看，实验性研究高于队列研究，队列研究高于病例对照研究，病例对照研究高于一般的描述性研究
D.
实施队列研究之前，最好先有描述性研究和病例对照研究的阳性结果
E.
生态学研究比一般的描述性研究论证能力强
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【简答题】The grass blades, brushing with the movements of their growth, made joyous gentle sounds, like the sighs of a maiden in love.
【判断题】When economists refer to investment, they mean the purchasing of stocks and bonds and other types of saving.
A.
正确
B.
错误
【单选题】Economists refer to the inputs that firms use to produce goods and services as
A.
derived factors.
B.
derived resources.
C.
factors of production.
D.
instruments of revenue.
【单选题】The word 'festive' in paragraph 2 can not be understood as ______.
A.
cheery
B.
fetish
C.
joyous
D.
merry
【简答题】No sooner than it began to rain．
【单选题】Thanks giving feasts are ______ with big dinners and joyous reunions on the fourth Thursday in November.
A.
rewarded
B.
awarded
C.
celebrated
D.
congratulated
【单选题】Economists use the term money to refer to
A.
all wealth.
B.
all assets, including real assets and financial assets.
C.
all financial assets, but real assets are not regarded as money.
D.
those types of wealth that are regularly accepted by sellers in exchange for goods and services.
【判断题】Economists refer to fluctuations in output as the "business cycle" because movements in output are regular and predictable.
A.
正确
B.
错误
【单选题】What word do economists use to refer to the purchase of goods that will be used in the future to produce more goods and services?
A.
capital
B.
consumption
C.
investment
D.
costs
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