79. The passage is mainly concerned with ______. (A). an attempt at developing recyclable tents (B). some efforts at making full use of cardboards (C). an unusual success of a graduation project (D). the effects of using cardboard tents on music festivals

25.Ⅱ. Grammar and Vocabulary (D)irections: (B)eneath each of the following sentences there are four choices marked (A), (B), (C) and (D). (C)hoose the one answer that best completes the sentence. Leaves are found on all kinds of trees, but they differ greatly ________ size and shape. (A). on (B). form (C). by (D). in

79. The passage is mainly concerned with ______.
(A). an attempt at developing recyclable tents
(B). some efforts at making full use of cardboards
(C). an unusual success of a graduation project
(D). the effects of using cardboard tents on music festivals

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