2015年11月26日，中国人民银行宣布发行中国航天纪念钞一枚，其设计展示了中国航天事业取得的伟大成就，充分表现了中国自古以来探索天空的理想和精神。新中国进入航天时代的标志是(　　)

根据拼音写汉字。

níng____成     昏yūn____ 

下面是课文《秋天的怀念》中描写母亲的动作、语言、神情、心理等的句子，表现了母爱的伟大。试结合上下文作具体分析。

①母亲就悄悄地躲出去，在我看不见的地方偷偷地听着我的动静。

②母亲扑过来抓住我的手，忍住哭声说：“咱娘儿俩在一块儿，好好儿活，好好儿活……”

③她憔悴的脸上现出央求般的神色。

④还记得那回我带你去北海吗？你偏说那杨树花是毛毛虫，跑着，一脚踩扁一个……

⑤她忽然不说了。对于“跑”和“踩”一类的字眼儿，她比我还敏感。

   More and more people like bicycling and it is no surprise. It is fun, healthy and good for the environment. Maybe that's why there are 1.4 billion bicycles and only 400 million cars on roads worldwide today. Bikes can take you almost anywhere, and there is no oil cost!
   Get on a bicycle and ride around your neighbourhood. You may discover something new all around you. Stopping and getting off a bike is easier than stopping and getting out  of your car. You can bike to work and benefit (受益) from the enjoyable exercise without polluting the environment. You don't even have to ride all the way.
   Folding (折叠) bikes work well for people who ride the train. Just fold the bike and take it with you. You can do the same on an airplane. A folding bike can be packed in a suitcase. You can also take a common bike with you when you fly. But be sure to look for information by getting on airline websites. Not all airlines are bicycle-friendly to travellers.
   Health Benefits of Bicycling:
   It helps to prevent heart diseases.   
   Bicycling helps to control your weight.
   A 15-minute bike ride to and from work three times a week burns off five kilos of fat in a year.
   Bicycling can improve your mood (心情).
   Exercise  like  bicycling  has  been  shown  to  make  people  feel  better,  more  relaxed  and self-confident.
   Bicycling is healthier than driving.