According to the passage, which is Not True of surveys via the Web？
A. They reduce the cost involved in data collection.
B. They are secure and easy-to-use in collecting data.
C. They provide more convincing conclusions on the matter surveyed.
D. They face fierce competitions from the traditional survey methods.
【C13】
A. purify
B. simplify
C. dirty
D. contaminate
【C7】
A. thinking
B. considering
C. thirsting
D. counting
In paragraph three, the name and the dates between parentheses______.
A. are a question of personal style
B. represent vital new information
C. identify the author
D. refer to a different author
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