— I'm in _______, _______.

如图，△ABC中，AC=3，BC=4，∠ACB=90°，E、F分别为AC、AB的中点，过E、F两点作⊙O，延长AC交⊙O于D．若∠CDO=$\frac{1}{2}$∠B，则⊙O的半径为（　　）

根据短文内容及首字母提示，补全空格内单词，使短文完整、通顺。

    Cao Wenxuan, Chinese children's fiction (小说) writer, w____ the Hans Christian Andersen Prize(安徒生奖)in April, 2016 , in Italy .

Cao Wenxuan was b____ in Yancheng, Jiangsu Province and he has t____ in Beijing University for over 30 years. He has w____ over 150 stories and novels. Some of them have been t____into English, F____, Japanese and so on. I like reading the novel n____ “Grass House”. It is m____up of nine parts which touched us deeply. The novel tells us how groups of children bravely f____ the difficulties and challenges of life. When the reporter I____ him, Cao Wenxuan said , “All of my stories are set in China, all of them are Chinese stories, but at the same time, they are the stories of the humankind(全人类).”

读下列三幅图和资料，回答问题．

材料一  如图1是冷热不均引起的大气运动图（实线表示等压面，箭头表示气流运动方向）．

材料二 图2是北京近地面多年平均气温分布图（单位：℃）；图3是北京城市环流模式图．

材料三；在2008年奥运会筹备中，北京市提出了“绿色奥运、科技奥运、人文奥运”的奥运会举办理念，大力开展环境治理，大搞植树造林活动．2005年，全市共完成绿化造林16万亩，植树1792万株，全市林木覆盖率达到50.5%．

看拼音，写汉字。

    sǎn                    bēn                     jiā                            biàn

小____         ____ 跑            ____ 减           ____ 化