果园里有苹果树420棵，梨树350棵，梨树和苹果树棵数的比是____∶____．

下列文学常识的表述不正确的一项是（   ）

    Hi everyone! Good news. A book sale.____will people drive cars in space? Will you meet traffic ____? You'll get answers from our books. Are ____ interesting for you? They can do heavy work. You ____enjoy short working hours. We've got some storybooks about them. What's the best way to buy products at very good prices? Our books will tell you something about online ____? 

    Welcome to the playground this Saturday.

    Have a nice day!

选出没有错别字的一组（   ）

中国地震台网测定：北京时间 2015 年 4 月 25 日 14 时 11 分在尼泊尔发生 8.1 级地震，震中位置是(28.2°N，84.7°E)。据此回答：

关于此次地震震中位置的叙述，正确的是（     ）