The second paragraph is mainly about______.
A. the differences between the Web-based and traditional surveys
B. the advantages of the Web-based surveys
C. the weaknesses of the traditional surveys
D. the cost involved in conducting traditional surveys
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Electrical resistance is a common property of all materials, ______.
A. only differs in degree
B. only in degree it differs
C. differing only in degree
D. and differing in degree only
If that desk is at least 100 years old.it is an authentic antique and valuable.
A. real
B. ancient
C. eminent
D. obsolete
It could be inferred from the passage that in the author's country the European model of professional training is______.
A. dependent upon the starting age of candidates
B. worth trying in various social sections
C. of little practical value
D. attractive to ever kind of professional
What makes traditional surveys unscientific according to the second paragraph？
A. The sampling is not made strictly randomly.
B. The interview has to be conducted face-to-face.
C. Improper questions are often included in a survey.
D. Selection of respondents is often a matter of personal decision.
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