A:③④
B:①③
C:②④
D:②③
洋葱根尖的成熟区细胞和人的小肠上皮细胞都具有的结构是( )
①细胞壁 ②细胞膜 ③细胞质 ④叶绿体 ⑤细胞核 ⑥中央大液泡 ⑦线粒体
Jenny says that this tour____(包括)visit to a science museum.
Well , ____( thanksgiving ) is my favourite festival.