【名词&注释】
细胞膜(membrane)、重要作用(an important role)、有选择性(has a selective)、植物种子(plant seed)、鸭跖草科(commelinaceae)
[单选题]鸭跖草科(commelinaceae)植物种子有( )。
A. 棱
B. 种脐
C. 胚盖
D. 棱、种脐及胚盖
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举一反三：
[单选题]Mary and I see each other ________,but not as often as we used to.
A. sooner or later
B. once in a while
C. in the end
D. more or less
[单选题]枣(Ziziphus jujuba Mill．)是我国特产，山西是主产省份之一。( )
A. 正确
B. 错误
[单选题]根毛区表皮的主要作用为( )。
A. 吸收
B. 保护
C. 分泌
D. 通气
[单选题]After graduating from college，I took some time off to go travelling_________， turned out to be a wise decision．
A. that
B. which
C. when
D. where
[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
A. 细胞膜的糖被在细胞间具有识别作用
B. 细胞膜对膜两侧物质的进出具有选择性
C. 细胞膜内外两侧结合的蛋白质种类有差异
D. 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.
A. “Unfortunately, computing was not part of our studies at school.”he said.“But I had been studying it in books and magazines for four years in my spare time. I knew what I wanted to do and never considered staying on at school. Most people in his business are fairly young. Anyway.”David added:“I would like to earn a million and I suppose early retirement is a possibility. You never know when the market might disappear.”
B. 第5题：In which way is David different from people of his age?
C. He often goes out with friends.
D. He lives with his mother.
E. He has a handsome income.
F. He graduated with six O-levels.
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