Online learning is also called distance education. Many American colleges and universities have been offering it for years. Online classes are usually taught by 43 who have been trained in online teaching. These classes can be highly interactive, 44 students communicate with each other and their teachers. Some classes require students to all log in at the same time so they can 45 live lectures by a professor. Students can also ask questions and work together on team projects. Many schools offer online education. Students should be especially careful of programs that offer a degree 46 for little or no work. These are known as diploma mills, and are illegal in the United States. Educational advisers also say that before you enter any program, make sure the work will 47 in your country. 【題組】44. (A)where (B)which (C)that (D)when
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