题目内容

双子叶植物根的初生结构中,初生木质部由( )和( )两部分组成,其中前者在外,后者在内,象这种发育形式被称为外始式向心发育。

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Which of the followings is not TRUE?

A. eBay is a global trading platform.
B. eBay can protide US with very close connection
C. Almost everything can be bought by eBay.
D. eBay has taken the place of the traditional way of-shopping.

禾本科植物,如小麦,叶脉维管束属于( )维管束。

周皮由( )、( )和( )三部分构成。

合同的订立需要经过要约和()两阶段。

A. 履约
B. 承诺
C. 要约邀请
D. 违约

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