单项选择题

Instead of researching and writing their papers, some students ______.

A．ask other students to write their papers
B．draw pictures instead
C．copy from reference books
D．copy papers or large parts of papers from the Internet
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单项选择题
Using the program developed at University of California at Berkeley, the papers are checked by using ______.
A．printing and looking carefully at hundreds of papers on the Internet
B．a search of many web pages and a comparison of words used
C．asking the student where they got the information in the paper
D．comparing all the papers which are turned in by the students
单项选择题
If teachers want to find out if their students wrote their own papers, ______.
A．they ask other teachers to read their students' papers
B．they ask their students to list their sources of information
C．they can sign up for the Internet service
D．they search the Internet and compare papers
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