单项选择题

Not only ______ people to send words, music, and codes to any pan of the world, it can also be used to communicate far into space.

A. enabled by radio
B. radio enables
C. does radio enable
D. has radio enabled
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单项选择题
Which two criteria are equally important in the calculation of the students’ final grade in the course
A．Homework and quizzes.
B．Quizzes and the final exam.
C．Class participation and the midterm exam.
D．Homework and class participation.
单项选择题
What does the speaker think of the hotline programmes
A．They are perfect.
B．They need to be improved.
C．They are nuisances.
D．They are dispensabl
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