[填空题] Last summer I spent days in the garden watching thousands of ants climbing up my peach tree. The tree has grown 【B1】 a warm wall on a side of the house. I am especially 【B2】 of it, not only because it 【B3】 delicious peaches, but because it has been 【B4】 through several freezing winters. During the summer, I 【B5】 that the leaves of the tree were beginning to fall. Groups of tiny aphis (蚜虫) were found on the underside of the 【B6】 . They were 【B7】 by a large group of ants which got a 【B8】 of honey from them. I immediately began to do an experiment which 【B9】 me interested for 24 hours, even though it 【B10】 to get rid of the ants. I tied sticky tape round the 【B11】 of the tree, making it 【B12】 for the ants to reach the aphis. The tape was so sticky that they did not dare to 【B13】 it. For a long time, I watched them 【B14】 around the foot of the tree. I even went out at 【B15】 with a flash and found with 【B16】 that the ants were 【B17】 gathering round my sticky tape without being able
A. A．branches
B．roots
C．leaves
D．tops

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