题目内容
From Boston to Los Angeles, from New York City to Chicago to Dallas, museums are either planning, building, or finishing wholesale expansion programs. These programs already have dramatically altered appearances and floor plans or are expected to do so in the not-too-distant future. In New York City alone, six major institutions have spread up and out into the air space and neighborhoods around them or are preparing to do so. The reasons for this activity are complex, but one factor is a consideration everywhere—space. With collections expanding, with the needs and functions of museums changing, empty space has become a very precious commodity. Probably nowhere in the country is this more tree than at the Philadelphia Museum of Art, which has needed additional space for decades and which received its last significant facelift ten years ago. Because of the space crunch, the Art Museum has become increasingly cautious in considering acquisitions and donations of art, in some cases passing up opportunities to strengthen its collections. Selling off works of art has taken on new importance because of the museum’s space problems. And increasingly, museum presidents have been forced to rotate one masterpiece into public view while another is sent to storage. Despite the clear need for additional gallery and storage space, however "the museum has no plan, no plan to break out of its envelope in the next fifteen years," according to Philadelphia Museum of Art’s president. Because of insufficient space the Philadelphia Museum of Art must ______.
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From Boston to Los Angeles, from New York City to Chicago to Dallas, museums are either planning, building, or finishing wholesale expansion programs. These programs already have dramatically altered appearances and floor plans or are expected to do so in the not-too-distant future. In New York City alone, six major institutions have spread up and out into the air space and neighborhoods around them or are preparing to do so. The reasons for this activity are complex, but one factor is a consideration everywhere—space. With collections expanding, with the needs and functions of museums changing, empty space has become a very precious commodity. Probably nowhere in the country is this more tree than at the Philadelphia Museum of Art, which has needed additional space for decades and which received its last significant facelift ten years ago. Because of the space crunch, the Art Museum has become increasingly cautious in considering acquisitions and donations of art, in some cases passing up opportunities to strengthen its collections. Selling off works of art has taken on new importance because of the museum’s space problems. And increasingly, museum presidents have been forced to rotate one masterpiece into public view while another is sent to storage. Despite the clear need for additional gallery and storage space, however "the museum has no plan, no plan to break out of its envelope in the next fifteen years," according to Philadelphia Museum of Art’s president. It can be inferred from the passage that ______.
叉树是结点的有限集合，这个有限集合或者为空集，或者由一个根结点及两棵不相交的、分别称为根的左子树和右子树的______组成。
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