In most cases, you can transplant a tree successfully, at any time, if you follow the instructions for planting a tree. The most

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问题     In most cases, you can transplant a tree successfully, at any time, if you follow the instructions for planting a tree. The most important thing is to dig out enough roots, but this process is difficult with a large tree.
    When you dig out the tree, leave a ball of earth around its roots. This ball of earth should measure about a foot wide for every inch of the tree trunk’s diameter. Dig deep enough to avoid cutting off too many taproots.
    It is wise to call in a professional tree expert to transplant a tree more than a few inches in trunk diameter.
To decide whether you can successfully transplant a tree yourself, you should ______.

选项 A、select your location carefully
B、measure the ball of earth around the tree roots
C、measure the diameter of the tree trunk
D、cut off as many taproots as you can reach

答案C

解析 细节题型从第二段第一、二句得知:当你要挖出一棵树时,要在树的根部留一团泥土。这团泥土的尺寸应以树干的直径为准;树干直径每增长一英寸,这团泥土就应增加大约英尺。因此“决定你自己是否能够移植一棵树”的关键是要看树干的直径到底有多大,因此选项C为答案。
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