I was ready to pay for my bananas at the grocery one night, when fear seized me. My wallet was gone. I could only have left it on the G9 bus, which was now speeding in the dark to some1station.
The2moment was quickly followed by mental math. How much time and money would it cost to replace the 3of that little wallet? The credit cards, the driver's license, the cash, all lost to the bus.
Two hours later, back at my house, I heard a knock on the door. My husband 4it while I was on the phone in the dining room. "Does Jennifer live here?" I heard a lady say. In my husband's hand was my wallet, with not a penny 5. She left before I could 6 make it to the door to offer my thanks.
After sharing the story online, I heard from someone, who 7 the lady as Erin Smith. Without 8, I called to thank her. She said she 9 my wallet on a bus seat. She 10 that going to a stranger's house was a 11 move, but she decided to take the chance. "If I were in that 12, I would want someone to try to find me," she said.
This one stranger responded beautifully to my small 13, but she actually wasn't the only one. Right after Erin 14 my wallet on the bus, she posted a picture of my driver's license to an online forum(论坛), trying to see 15 anyone knew me. No sooner did she leave my doorstep than I had emails from two women whose kids go to my son's nursery and who recognized my face. I've never 16 words with those moms beyond small talk, but they wanted to help. I read that people are more divided than ever, but that's not how the people I17tend to act.
18, I feel blessed someone had wanted to help a stranger. Erin had gone 19what almost anyone would have done, finding my house on a bitterly cold night, and for that I was extremely 20.
①SiO2 ②Al2O3 ③KAl(SO4)2 ④Ca(HCO3)2 ⑤(NH4)2CO3 ⑥Al
|﹣
+(﹣1)3 .

take; collect; visit; wait; go |
──《史记》
①是由我国社会主义性质和基本国情决定的 ②是由我国基本的分配制度决定的
③能促进国民经济持续健康发展 ④形成了各种所有制经济平等竞争、相互促进的局面
),x∈[0,π]的递增区间是.
(三)
来了!中国空间站
①北京时间4月29日11时许,中国在文昌航天发射场用长征五号B遥二运载火箭发
射空间站天和核心舱。
天和核心舱是个啥
②天和核心舱是中国发射的首个空间站舱段。中国空间站基本构型包括天和核心舱、问天实验舱和梦天实验舱3个舱段,整体呈T字构型。其中,天和核心舱全长16.6米,最大直径4.2米,发射质量22.5吨,是未来空间站的管理和控制中心。它还具备交会对接、转位与停泊、乘组长期驻留、航天员出舱、保障空间科学实验等能力。
③为了让航天员在太空中的长期生活更加舒适,天和核心舱在设计上较过去有了很大突破,供航天员工作生活的空间约50立方米,未来加上两个实验舱后,整体能够达到110立方米。
空间站:“三室两厅还带储藏间”
④空间站的开建,标志着未来中国在近地轨道拥有“太空家因”将不再是梦。除天和核心舱以外,中国空间站的问天实验舱、梦天实验舱均作为支持大规模舱内外空间科学实验和技术试验载荷支持舱段。
⑤如果神舟飞船是一辆轿车,天宫一号和天宫二号就相当于一室一厅的房子,而空间站就是三室两厅还带储藏间,算是“豪宅”了。
⑥据悉,空间站上将部署10余个先进科学实验柜、舱外载荷安装平台以及共轨飞行的巡天望远镜,提供空间科学实验条件,解决大规模空间应用问题。
“太空家园”谁来住
⑦未来“三室两厅还带储藏间”的空间站将由谁来入住?在空间站的关键技术验证和建造阶段,安排4次载人飞行任务,每次飞行乘组是3名航天员,他们将执行空间站技术验证、建造以及科学实验的任务,乘组的驻留时间根据任务安排,长期在轨将达到3至6个月。
⑧空间站不仅活动空间大,而且航天员在空间站的补给也得到了更好保障。为了让航天员实现更久地在轨停留,空间站设计了完整的可再生生命保障系统。航天员呼出的水蒸气会通过冷凝水方式回收,排泄的尿液也会回收净化,重新作为饮用水和生活用水使用。电解制氧时产生的氢气与航天员呼出的二氧化碳,将通过化学反应生成氧气,这也能够降低氧气的补给需求。
后续任务如何建
⑨按照空间站建造任务规划,今明两年中国将接续实施11次飞行任务,包括3次空间站舱段发射、4次货运飞船以及4次载人飞船发射,于2022年前后完成空间站在轨建造,实现中国载人航天工程“三步走”发展战略“第三步”的任务目标。空间站在轨建造任务期间,长征五号B运载火箭、长征二号F运载火箭和长征七号运载火箭3型火箭将各司其职,为中国空间站的建造运营搭建起“天地运输走廊”。
⑩中国已经和联合国外空司推进落实了第一批技术试验项目,也与多个国家或者地区的空间科学或者航天科技方面的研究机构达成相关合作协议。
⑪古有千里鲲鹏逍遥游,今看九霄天和展翅飞。伴随着长征五号B遥二火箭一飞冲天,天和核心舱即将“入列”,“完整体” 的中国空间站将不再遥远。
材料一:空间站”一词来自经典著作。尽管很早就有了“空间站”这个概念,但直到1923年,欧洲火箭之父、现代航天学奠基人之一的赫尔曼·奥伯特才在其经典著作《飞向星际空间的火箭》里正式创造了“空间站”一词。然而从创造“空间站”一词到人类发射第一个空间站,其间又经历了40多年的时间。1971年4月19日,前苏联发射了“礼炮1号”空间站,这是人类历史上第一个空间站。
材料二:国际空间站是目前在轨运行最大的空间平台。它的规模大约有423吨,由美国、俄罗斯、加拿大、日本等16国联合,先后经历12年建造完成。中国空间站在总体规模上不及国际空间站,但由我国自主建造,实现了部组件全部国产化,原材料全部国产化,关键核心元器件100%自主可控。建成中国空间站,是我国从航天大国迈向航天强国的重要标志,必将再次激发全国各族人民的自豪感,助力实现中华民族伟大复兴的中国梦。