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Radio is one of __________ means of sending news and information. A.the most common B. the commonest C. more common D. common

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In recent years special attention has been paid __________ developing the students' productive skills. A.over B. to C. on D. in

根据所听到的内容作答_____. A)They broke down and could go no further. B)They haven't achieved much. C)They have produced a general agreement. D) They haven’t started vet.

By the end of this semester, we surely __ a satisfactory solution to the problem. A.have

根据听到的内容作答____. A) There are 250 million plants eaten by insects. B) There are fewer plants than 250 million years ago. C) They have their way of guarding against insects. D) They have a better immune system than before.

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