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掌握了GRE阅读里的长难句，到了实战演习的时候了。GRE阅读练习帮助GRE考生循序渐进地进行复习和总结。希望GRE考生在进行GRE阅读练习时，也按着考试时候的时间规定自己的练习，这样才能有效果。 Questions 1-4 Along a street that is currently without trees, seven trees are to be planted in the pattern 1 3 5 7 2 4 6 Where each number designates the position of a tree. No more than two kinds of trees can be planted. If maples are used, no maple can be planted adjacent to or immedi-ately diagonally opposite another maple. Two trees are adjacent to each other if the numbers of their positions differ by two, and immediately diagonally opposite if their numbers differ by one. The following trees, of three kinds, are available for planting: Three red oaks Four maples Four sycamores 1.Which of the following can be the trees planted along the side of the street that has four trees, in order of their positions beginning with position 1? Maple, sycamore, maple, sycamore Maple, sycamore, red oak, maple Red oak, maple, maple, red oak Sycamore, sycamore, maple, maple Sycamore, sycamore, red oak, red oak | 
