“a variety of+复数名词”作主语时，是用单数还是用复数？请帮助找一些权威用法。例句不少于10个，本人

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一、“a variety of+复数名词”作主语，谓语用复数的实例

■A variety of treatment methods exist. 有各种各样的治疗方法。——引自《柯林斯高级英语用法词典》(Collins Cobuild English Usage)（上海外语教育出版社）第971页

■A great variety of animals survive there. 那儿仍然生存着各种各样的动物。——引自《柯林斯高级英语用法词典》(Collins Cobuild English Usage)（上海外语教育出版社）第971页

■There are a variety of apples in the shop. 商店里有各种各样的苹果。——引自《新时代英语惯用法词典》（外文出版社）variety 词条

■There are a wide variety of people on the earth. 地球上有各种各样的人。——引自《外研社·建宏英汉多功能词典》（外研社）variety 词条

二、“a variety of+复数名词”作主语，谓语用单数的实例

■There is a wide variety of flowers. 有很多种类的花。——引自张道真的《初级英语词典》（外研社）variety 词条

■There’s a large variety of goods in the shops. 商店里有各式各样的商品。——引自《张道真英语用法》goods 词条

■wine bar: place where a variety of wines is sold and drunk, sometimes with food (供应各种果酒的)酒吧，酒馆(有时供应佐酒食物) ——引自《牛津高阶英汉双解词典》(Oxford Advanced Learner’s Dictionary of Current English) (第四版) win 词条

■There was a considerable variety of opinions. 这里有各种各样的看法。——引自《新时代英语惯用法词典》（外文出版社）variety 词条

三、“a variety of+复数名词”作主语，谓语用单数 / 复数的实例

■A variety of reasons were [or was] offered for the long delay. 引自《钱伯斯基础英语词典》(Chambers Essential English Dictionary)（外研社）variety词条

■There are [or There is] a variety of excellent schools in the area. 引自《钱伯斯基础英语词典》(Chambers Essential English Dictionary)（外研社）variety词条

There is a wide variety of patterns to choose from.有种类繁多的图案可供选择。 （牛津高阶英汉双解词典 第七版）

There is a wide variety of new music to be dicovered in every corner of the world