Which of the following terms is defined ill the passage（）
A. Survey (line 1)
B. Public opinion (line 8)
C. Representative sampling (line 13)
D. Response rate (line 22)
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It can be inferred from the passage that one reason that sociologists may become frustrated with questionnaires is that（）
A. respondents often do not complete and return questionnaires
B. questionnaires are often difficult to read
C. questionnaires are expensive and difficult to distribute
D. respondents are too eager to supplement questions with their own opinions
What does the passage mainly discuss（）
A. How sediments were built up in oceans during the Cretaceous period
B. How petroleum was formed in the Mesozoic era
C. The impact of changes in oceanic animal and plant life in the Mesozoic era
D. The differences between plankton found in the present era and Cretaceous plankton
SWOT分析的机会与威胁分析将注意力放在（）。
A. 现有竞争对手之间的抗衡
B. 对行业发展现状和前景的综合分析
C. 外部环境的变化及对企业的可能影响上
D. 企业自身的实力及其与竞争对手比较
Hydrofoils can exceed 75 miles per hour, as compared with conventional watercraft, whose maximum speeds （） approach 50 miles per hour.
A. are rarely
B. rarely
C. of rarely
D. they rarely
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