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Is it a tree? Is it a bear? If you’re looking at a tree in the shape of a bear, it’s a topiary(林木雕塑). A topiary is a tree or a bush(灌木) that is trained into a shape. Growing a topiary garden takes both time and skills. A topiary gardener should make a drawing first. The drawing shows the final shape that the gardener likes. The gardener then chooses a bush for the topiary. It may be one that just planted or one that is already in place. In June of the plant’s first year, the gardener looks for new leaves. When the leaves grow, it’s time to shape(给……造型) the bottom of the bush. It needs about five years. The top is not trimmed during this time. In the fifth year, the bush grows tall enough for shaping. Then the gardener begins to shape the whole bush. Once a topiary has been starte d, it needs care all year. In the summer it must be cut many times to keep its shape. This cutting also helps the bush grow. In the winter the bushes don’t grow. The gardeners have to brush snow of the plants, or snow may hurt some parts of them. Topiary gardening is very old art. The Romans did it in the first Century. In the sixteenth century, people in Europe like topiaries too. By the late 1600s, topiaries were also grown in America. Today it’s popular in many parts of the world. 小题1: Put the following in the right order according to the passage. a. The gardener chooses a bush for the topiary. b. The whole bush grows tall enough for shaping. c. The gardener begins to shape the bottom of the bush. d. The gardener draws the shape of a topiary. A.d→a→b→c B.b→c→a→d C.a→d→c→b D.d→a→c→b 小题2:In which part of the world did the topiary gardening begin first? A.In Rome. B.In Europe. C.In America. D.In Africa.
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举一反三
【简答题】液压系统中单向阀的作用是()。
【判断题】液压系统中的换向阀的作用是使液压油只能单向流动。
A.
正确
B.
错误
【单选题】下列不属于机械除尘设备是的( )。
A.
重力沉降室
B.
惯性除尘器
C.
旋风分离器
D.
文丘里除尘器
【单选题】液压系统中单向阀的作用是( )。
A.
减压
B.
换向
C.
保证油液只能向一个方向流动
D.
保洁
【判断题】编制时点数列,各项指标的时点间隔长短必须保持一致。()
A.
正确
B.
错误
【单选题】属于重力沉降分离设备的是()。
A.
板框压滤机
B.
离心机
C.
降尘室
D.
旋风分离器
【单选题】下列沉降设备中,属于重力沉降设备的是()。
A.
旋风分离器
B.
碟式分离机
C.
沉降槽
D.
螺旋卸料离心机
【多选题】下列属于重力沉降的设备的是
A.
连续沉降槽
B.
双锥分级器
C.
旋液分离器
D.
三足离心机
【单选题】YT4543型动力滑台液压系统中单向阀5的作用是( )。
A.
隔离进油路和回油路
B.
保护液压泵
C.
实现缸的快进
D.
实现变量泵备压
【简答题】液压系统中、单向阀的作用是保证油液只能()运动。
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