下列各组词语中，没有错别字的一组是（     ）

阅读下面短文，掌握其大意，然后从所给的A、B、C和D项中，选出最佳选项。

    Animals United is a 3D German cartoon. Reinhard Klooss and Holger Tappe directed it. It is a story about animals.They get together to find 1. Along their journey, lots of funny things 2, and of course, they have a lot of adventures

    The animals in the grassland in Africa are 3 for coming flood. However, this year's flood seems to come later than in other years. The animals become unhappy and 4. At the same time, some animals from other places come to the grasslands to look for peace. However, the things are5 because the water is becoming less and less. 6 they decide to look for the river.

    Finally, they find the reason why they don't have any water to drink. People7a dam like a strong wall so that humans can have a better life. After a long fight with humans, they let the world know 8 that animals are in danger.

    This film is about environmental matters. The humans are the bad and the animals are the good. This film is to give humans a warning.They must not destroy the homes of animals or damage nature in order to9a better life. Humans should know that animals also have their own 10.

大气中近70%的氧气来源于____。

84消毒液是一种有刺激性气味的高效液体消毒剂．主要成分为次氯酸钠（NaClO），广泛用于宾馆、旅游、医院、食品加工、家庭等的卫生消毒．请阅读信息并回答：

（1）次氯酸钠的制取原理是氯气与氢氧化钠反应生成氯化钠，次氯酸钠和水，化学反应方程式为　____ ；

（2）消毒液中次氯酸钠自身没有消毒作用，有消毒作用的是次氯酸钠与空气中二氧化碳反应得到的次氯酸（HClO），化学方程式为　____　；

（3）84消毒液是含氯消毒剂，氯气是一种挥发性的有毒气体，因此，84消毒液必须____保存．