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GRE模拟题：自测试题二（7）
there must be
(A)at least one maple
(B)at least one red oak
(C)at least one sycamore
(D)at most one maple
(E)at most one red oak
22.If maples are planted，the side of the street that has four trees must have
(A)red oaks in positions 1 and 7
(B)red oaks in positions 3 and 5
(C)sycamores in positions 1 and 3
(D)sycamores in positions 1 and 7
(E)sycamores in positions 3 and 5
23.A list of the fifteen operas most frequently performed in recent times includes no works by the nineteenth-century German composer Richard Wagner. Although music producers tend to produce what audiences want，relative infrequency of performance probably does not indicate lack of popularity in Wagner's case，since Wagner's operas are notoriously expensive to perform on stage. Which of the following，if true，most strongly supports the conclusion of the argument above?
(A)The list of most frequently performed operas does not include operas produced by small
amateur groups.
(B)Some opera companies are backed by patrons who are willing to commit large sums of money in order to enjoy lavish productions.
(C)All of the fifteen most frequently performed operas of recent times are works that have
been popular for at least 75 years.
(D)More recordings have been produced recently of the works of Wagner than of the works of any other composer of opera.
(E)Operatic works of all kinds have been increasing
