Something as small as a worm(虫) may be composed of millions of cells(细胞).
举一反三
- The body(人体) is composed of specialized groups of cells(细胞), the first of which are called tissues(组织).
- which cell can only exit in small intestine: A: endocrine cells B: stem cells C: goblet cells D: Paneth cells E: absorptive cells
- A few sellers may behave as if they operate in a perfectly competitive market if the market demand is: A: highly inelastic. B: very elastic. C: unitary elastic. D: composed of many small buyers.
- During American War of Independence, the British army was composed mainly of farmers, craftsmen, and small traders.( )
- 转基因小鼠技术采用的细胞是( )。 A: ES cells B: EG cells C: B cells D: T cells