单项选择题

The number of specialists has enormously increased mainly because of ______.

A．academic mobility
B．interdisciplinary research
C．specialization
D．modernization of transportation
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单项选择题
A．they seem to be fun to beginnersB．they allow big winsC．they are easy to playD．big wins seem possible given enough time and money
A．they seem to be fun to beginners
B．they allow big wins
C．they are easy to play
D．big wins seem possible given enough time and money
单项选择题
Users of plagiarism detection tools make a point of using the service secretly because ______.
A．they do not want to ruin their business
B．they do not want to ruin the reputation of the violators involved
C．they cannot decide what amounts to actual plagiarism
D．they think it is not worthwhile
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