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【单选题】
Which of the following refers to panel data?A.
Data on the unemployment rate in a country over a 5-year period
B.
Data on the birth rate, death rate and population growth rate in developing countries over a 10-year period.
C.
Data on the income of 5 members of a family on a particular year.
D.
Data on the price of a company’s share during a year.
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举一反三
【单选题】中国共产党第十八届中央委员会第六次全体会议提出，（）是全党统一意志、统一行动、步调一致前进的重要保障，是党内政治生活的重要内容。
A.
纪律严明
B.
党的领导
C.
党规党纪
D.
政治规矩
【单选题】The program did much to the little-know writers.
A.
mean
B.
wonder
C.
popularize
D.
pack