地球上最初的生命起源于( )
A:原始大气
B:原始大陆
C:原始海洋
D:原始森林
I am not used to the food here. He isn't, _______.
在一片草坪中生长着蒲公英、铁树、月季、雪松、国槐,按照下列哪一项标准可把这些植物分为两大类?( )
—What's in the basket?
— ______ some bread. And ____ two tins of chicken, too.