长为12厘米，宽为3厘米的长方形，周长是（）厘米。 发布时间：2017-05-13 16:03 │ 来源：www.tikuol.com 题型：填空题 问题： 长为12厘米，宽为3厘米的长方形，周长是（ ）厘米。
题型：填空题 阅读理解。 Everybody loves oranges. They are sweet and juicy. Some oranges do not have any seeds (种子). Somehave a thick skin (厚皮) and some have a thin skin. The orange tree is beautiful. It has a lot of shiny (有光泽的) green leaves. The small white flowers smell very sweet. An orange tree has flowers and fruit at the same time. Farmers (农民) in other parts of Asia and the Middle East (中东) learned to raise (种植) oranges from the Chinese. Then they taught (教) Europeans (欧洲人). Orange is both a fruit and a color. The color of oranges is so beautiful that in English we use the nameof the fruit for the color. 1. Oranges are ______. [ ]A. shiny and greenB. old and wild C. sweet and juicy D. thin and white 2. Some oranges do not have ______. [ ]A. seeds B. sections C. flowers D. a skin 3. Orange leaves are ______. [ ]A. shiny B. thick C. sweet D. wild4. There are many ______ orange trees in China today. [ ]A. shiny B. thin C. wild D. thick 5. Europeans learned to plant orange trees from farmers in ______. [ ]A. the Middle East and Asia B. Florida C. China D. Spain 查看答案
题型：填空题 设函数f(x)=-1(x＜0)0 (x=0)1 (x＞0)，则当a≠b时，a+b+(a-b)•f(a-b)2的值应为（ ）A．|a|B．|b|C．a，b中的较小数D．a，b中的较大数 查看答案