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练习说明：
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Step 1
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用所学构成类和属性类名词描述“京沪高速公路”，如：
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side（边）
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It has two sides. Each side has two or three paths.
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part（部分）
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The highway has different parts, for example, Beijing-jinan, Nanjing-shanghai.
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size（长度）
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The whole distance of it is 1200 kilometers.
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position（位置）
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The starting point is at Beijing, the end is in Shanghai.
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There’re many tollgates along the road.
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There’re many stations along the road. The drivers can have a break in these stations.
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quality（质量）
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It is a first-level highway.
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Step 2
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用所学形容词描述“京沪高速公路”，如：
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长短
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It is long.
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宽窄
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It is wide.
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直斜
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It is straight in most parts, but it is curved in some other parts.
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质地
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It is smooth in most parts, but it is rough in some other parts.
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