正确答案: D

棱、种脐及胚盖

题目：鸭跖草科植物种子有( )。

解析：D

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举一反三的答案和解析：

[单选题]Mary and I see each other ________,but not as often as we used to.

once in a while

[单选题]枣(Ziziphus jujuba Mill．)是我国特产，山西是主产省份之一。( )

正确

[单选题]根毛区表皮的主要作用为( )。

吸收

[单选题]After graduating from college，I took some time off to go travelling_________， turned out to be a wise decision．

which

[单选题]细胞膜在细胞的生命活动中具有重要作用。下列相关叙述不正确的是

载体蛋白是镶在细胞膜内外表面的蛋白质

[单选题]根据内容， 回答下面问题：Computer programmer David Jones earns￡35,000 a year designing new computer games, yet he cannot find a bank ready to let him have a credit card. Instead, he has been told to wait another two years, until he is 18. The 16-year-old works for a small firm in Liverpool, where the problem of most young people of his age is finding a job. David’s firm neleases(推出)two new games for the fast growing computer market each month.But David’s biggest headache is what to do with his money. Even though he earns a lot, he cannot drive a car, take out a mortgage(抵押贷款)，or get credit cards. David got his job with the Liverpool-based company four months ago, a year after leaving school with six O-levels and working for a time in a computer shop.“I got the job because the people who run the firm knew I had already written some programs,”he said. David spends some of his money on records and clothes, and gives his mother 50 pounds a week. But most of his spare time is spent working.

He has a handsome income.