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7.

A. Because most of the teaching is done one radio or TV.
Because students doing any jobs can be accepted.
C. Because students don't need to pass exams to be accepted.
D. Because students at different ages can be accepted.

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8.

A. To help people who missed university education when they were young.
B. To bring radio and television into the field of education.
C. To offer more people opportunities to receive university education.
D. To help people who would rather study at home than go to school.

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9.

A. 238
B. 382
C. 328
D. 283

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10.

A. Send written work to a tutor.
B. Spend 3 weeks as a full-time student.
C. Receive advice at a study center.
D. Take part in the final examinations.

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若A1,…,An都可逆，则A1…An也可逆,且（A1…An）-1＝（An）-1…（A1）-1．( )

A. 对
B. 错

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7.

A. Because most of the teaching is done one radio or TV. Because students doing any jobs can be accepted. C. Because students don't need to pass exams to be accepted. D. Because students at different ages can be accepted.

8.

9.

10.

若A1,…,An都可逆，则A1…An也可逆,且（A1…An）-1＝（An）-1…（A1）-1．( )

A. Because most of the teaching is done one radio or TV.
Because students doing any jobs can be accepted.
C. Because students don't need to pass exams to be accepted.
D. Because students at different ages can be accepted.